[FFmpeg-devel] [PATCH 1/6] avcodec/osq: Check that pkt_offset does not exceed pkt size

[FFmpeg-devel] [PATCH 1/6] avcodec/osq: Check that pkt_offset does not exceed pkt size

[Michael Niedermayer]

Fixes: out of array access
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6227491892887552
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6268561729126400
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6414805046788096
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6538151088488448
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6608131540779008

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/osq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/osq.c b/libavcodec/osq.c
index e7f11691d2e..bcc75fef6fc 100644
--- a/libavcodec/osq.c
+++ b/libavcodec/osq.c
@@ -408,6 +408,9 @@ static int osq_receive_frame(AVCodecContext *avctx, AVFrame *frame)
     GetBitContext *gb = &s->gb;
     int ret, n;
 
+    if (s->pkt_offset > s->pkt->size)
+        s->pkt_offset = 0;
+
     while (s->bitstream_size < s->max_framesize) {
         int size;
 
-- 
2.17.1

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[FFmpeg-devel] [PATCH 2/6] avcodec/wavarc: Fix integer overflwo in do_stereo()

[Michael Niedermayer]

Fixes: signed integer overflow: 148676193 - -2006512262 cannot be represented in type 'int'
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-5963163952349184

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/wavarc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/wavarc.c b/libavcodec/wavarc.c
index b954e8800cd..48c673fdea4 100644
--- a/libavcodec/wavarc.c
+++ b/libavcodec/wavarc.c
@@ -154,11 +154,11 @@ static void do_stereo(WavArcContext *s, int ch, int correlated, int len)
     } else {
         if (correlated) {
             for (int n = 0; n < nb_samples; n++)
-                s->samples[1][n + len] += s->samples[0][n + len];
+                s->samples[1][n + len] += (unsigned)s->samples[0][n + len];
         }
         for (int n = 0; n < len; n++) {
             s->pred[0][n] = s->samples[1][nb_samples + n];
-            s->pred[1][n] = s->pred[0][n] - s->samples[0][nb_samples + n];
+            s->pred[1][n] = s->pred[0][n] - (unsigned)s->samples[0][nb_samples + n];
         }
     }
 }
-- 
2.17.1

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[FFmpeg-devel] [PATCH 3/6] avcodec/wavarc: Allocate AV_INPUT_BUFFER_PADDING_SIZE

[Michael Niedermayer]

Fixes: overread
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-5963163952349184
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-6048030137909248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/wavarc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/wavarc.c b/libavcodec/wavarc.c
index 48c673fdea4..9ba95143b8a 100644
--- a/libavcodec/wavarc.c
+++ b/libavcodec/wavarc.c
@@ -111,7 +111,7 @@ static av_cold int wavarc_init(AVCodecContext *avctx)
     }
 
     s->max_framesize = s->nb_samples * 16;
-    s->bitstream = av_calloc(s->max_framesize, sizeof(*s->bitstream));
+    s->bitstream = av_calloc(s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE, sizeof(*s->bitstream));
     if (!s->bitstream)
         return AVERROR(ENOMEM);
 
-- 
2.17.1

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[FFmpeg-devel] [PATCH 4/6] avcodec/wavarc: Check k in decode_5elp()

[Michael Niedermayer]

regression since 18b2ecc24778140c2bc798ed64842dc8feb6dc3a

Fixes: assertion failure
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-6280165808013312

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/wavarc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/wavarc.c b/libavcodec/wavarc.c
index 9ba95143b8a..a9d98f0c55e 100644
--- a/libavcodec/wavarc.c
+++ b/libavcodec/wavarc.c
@@ -539,6 +539,8 @@ static int decode_5elp(AVCodecContext *avctx,
         if (block_type >= 0 && block_type <= 7) {
             k = 1 + (avctx->sample_fmt == AV_SAMPLE_FMT_S16P);
             k = get_urice(gb, k) + 1;
+            if (k >= 32)
+                return AVERROR_INVALIDDATA;
         }
 
         if (block_type <=  2 || block_type ==  6 || block_type == 13 ||
-- 
2.17.1

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[FFmpeg-devel] [PATCH 5/6] avcodec/jpegxl_parse: Cleanup on error in read_vlc_prefix()

[Michael Niedermayer]

Fixes: leak
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6167847715602432

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/jpegxl_parser.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/jpegxl_parser.c b/libavcodec/jpegxl_parser.c
index 6656ed35c51..17e87d5cc34 100644
--- a/libavcodec/jpegxl_parser.c
+++ b/libavcodec/jpegxl_parser.c
@@ -777,8 +777,10 @@ static int read_vlc_prefix(GetBitContext *gb, JXLEntropyDecoder *dec, JXLSymbolD
         }
     }
 
-    if (total_code != 32768 && level2_codecounts[0] < dist->alphabet_size - 1)
-        return AVERROR_INVALIDDATA;
+    if (total_code != 32768 && level2_codecounts[0] < dist->alphabet_size - 1) {
+        ret = AVERROR_INVALIDDATA;
+        goto end;
+    }
 
     for (int i = 1; i < dist->alphabet_size + 1; i++)
         level2_codecounts[i] += level2_codecounts[i - 1];
-- 
2.17.1

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[FFmpeg-devel] [PATCH 6/6] avformat/mov: Check avif_info

[Michael Niedermayer]

Fixes: leak
Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6674082962997248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 93c1f9e929a..52939a373ec 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -7767,7 +7767,7 @@ static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         return 0;
     }
 
-    if (c->fc->nb_streams) {
+    if (c->fc->nb_streams || c->avif_info) {
         av_log(c->fc, AV_LOG_INFO, "Duplicate iloc box found\n");
         return 0;
     }
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH 1/6] avcodec/osq: Check that pkt_offset does not exceed pkt size

[Paul B Mahol]

On Thu, Sep 21, 2023 at 8:09 PM Michael Niedermayer <michael@niedermayer.cc>
wrote:

> Fixes: out of array access
> Fixes:
> 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6227491892887552
> Fixes:
> 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6268561729126400
> Fixes:
> 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6414805046788096
> Fixes:
> 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6538151088488448
> Fixes:
> 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6608131540779008
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by
> <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
> Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/osq.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/libavcodec/osq.c b/libavcodec/osq.c
> index e7f11691d2e..bcc75fef6fc 100644
> --- a/libavcodec/osq.c
> +++ b/libavcodec/osq.c
> @@ -408,6 +408,9 @@ static int osq_receive_frame(AVCodecContext *avctx,
> AVFrame *frame)
>      GetBitContext *gb = &s->gb;
>      int ret, n;
>
> +    if (s->pkt_offset > s->pkt->size)
> +        s->pkt_offset = 0;
>

This is more hack than real fix.

Can you provide input file?


> +
>      while (s->bitstream_size < s->max_framesize) {
>          int size;
>
> --
> 2.17.1
>
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>
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> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
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Re: [FFmpeg-devel] [PATCH 1/6] avcodec/osq: Check that pkt_offset does not exceed pkt size

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 2221 bytes --]

On Thu, Sep 21, 2023 at 08:14:31PM +0200, Paul B Mahol wrote:
> On Thu, Sep 21, 2023 at 8:09 PM Michael Niedermayer <michael@niedermayer.cc>
> wrote:
> 
> > Fixes: out of array access
> > Fixes:
> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6227491892887552
> > Fixes:
> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6268561729126400
> > Fixes:
> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6414805046788096
> > Fixes:
> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6538151088488448
> > Fixes:
> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6608131540779008
> >
> > Found-by: continuous fuzzing process
> > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by
> > <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
> > Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavcodec/osq.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/libavcodec/osq.c b/libavcodec/osq.c
> > index e7f11691d2e..bcc75fef6fc 100644
> > --- a/libavcodec/osq.c
> > +++ b/libavcodec/osq.c
> > @@ -408,6 +408,9 @@ static int osq_receive_frame(AVCodecContext *avctx,
> > AVFrame *frame)
> >      GetBitContext *gb = &s->gb;
> >      int ret, n;
> >
> > +    if (s->pkt_offset > s->pkt->size)
> > +        s->pkt_offset = 0;
> >
> 
> This is more hack than real fix.

why ?

pkt->size is reset outside the codec, so either it needs to be
checked on codec entry or the codec should not use
internal->in_pkt and expect its size to be conserved
or implement flush() or something

ff_decode_flush_buffers() for example will clear teh packet

if you prefer i can implement flush() and reset pkt_offset in it
that probably would achieve teh same
just say if you prefer that ?

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
some war or other, in order that the people may require a leader. -- Plato

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Re: [FFmpeg-devel] [PATCH 1/6] avcodec/osq: Check that pkt_offset does not exceed pkt size

[Paul B Mahol]

On 9/22/23, Michael Niedermayer <michael@niedermayer.cc> wrote:
> On Thu, Sep 21, 2023 at 08:14:31PM +0200, Paul B Mahol wrote:
>> On Thu, Sep 21, 2023 at 8:09 PM Michael Niedermayer
>> <michael@niedermayer.cc>
>> wrote:
>>
>> > Fixes: out of array access
>> > Fixes:
>> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6227491892887552
>> > Fixes:
>> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6268561729126400
>> > Fixes:
>> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6414805046788096
>> > Fixes:
>> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6538151088488448
>> > Fixes:
>> > 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6608131540779008
>> >
>> > Found-by: continuous fuzzing process
>> > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
>> > Signed-off-by
>> > <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
>> > Michael Niedermayer <michael@niedermayer.cc>
>> > ---
>> >  libavcodec/osq.c | 3 +++
>> >  1 file changed, 3 insertions(+)
>> >
>> > diff --git a/libavcodec/osq.c b/libavcodec/osq.c
>> > index e7f11691d2e..bcc75fef6fc 100644
>> > --- a/libavcodec/osq.c
>> > +++ b/libavcodec/osq.c
>> > @@ -408,6 +408,9 @@ static int osq_receive_frame(AVCodecContext *avctx,
>> > AVFrame *frame)
>> >      GetBitContext *gb = &s->gb;
>> >      int ret, n;
>> >
>> > +    if (s->pkt_offset > s->pkt->size)
>> > +        s->pkt_offset = 0;
>> >
>>
>> This is more hack than real fix.
>
> why ?
>
> pkt->size is reset outside the codec, so either it needs to be
> checked on codec entry or the codec should not use
> internal->in_pkt and expect its size to be conserved
> or implement flush() or something
>
> ff_decode_flush_buffers() for example will clear teh packet
>
> if you prefer i can implement flush() and reset pkt_offset in it
> that probably would achieve teh same
> just say if you prefer that ?

Yup, that is much cleaner, go ahead with that solution with flush().
I forgot about flush() case completely.

>
> thx
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> When the tyrant has disposed of foreign enemies by conquest or treaty, and
> there is nothing more to fear from them, then he is always stirring up
> some war or other, in order that the people may require a leader. -- Plato
>
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Re: [FFmpeg-devel] [PATCH 6/6] avformat/mov: Check avif_info

[Anton Khirnov]

Quoting Michael Niedermayer (2023-09-21 20:09:12)
> Fixes: leak
> Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6674082962997248
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavformat/mov.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavformat/mov.c b/libavformat/mov.c
> index 93c1f9e929a..52939a373ec 100644
> --- a/libavformat/mov.c
> +++ b/libavformat/mov.c
> @@ -7767,7 +7767,7 @@ static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
>          return 0;
>      }
>  
> -    if (c->fc->nb_streams) {
> +    if (c->fc->nb_streams || c->avif_info) {

I remember seeing this patch before and asking whether the first
condition is not redundant now.

-- 
Anton Khirnov
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Re: [FFmpeg-devel] [PATCH 6/6] avformat/mov: Check avif_info

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 1364 bytes --]

On Thu, Sep 28, 2023 at 12:37:57PM +0200, Anton Khirnov wrote:
> Quoting Michael Niedermayer (2023-09-21 20:09:12)
> > Fixes: leak
> > Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6674082962997248
> > 
> > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavformat/mov.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/libavformat/mov.c b/libavformat/mov.c
> > index 93c1f9e929a..52939a373ec 100644
> > --- a/libavformat/mov.c
> > +++ b/libavformat/mov.c
> > @@ -7767,7 +7767,7 @@ static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
> >          return 0;
> >      }
> >  
> > -    if (c->fc->nb_streams) {
> > +    if (c->fc->nb_streams || c->avif_info) {
> 
> I remember seeing this patch before and asking whether the first
> condition is not redundant now.

right, the author of the underlaying code also suggested its redundant,
so as suggested there ill apply it with just the 2nd check

thx

[...]
-- 
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No human being will ever know the Truth, for even if they happen to say it
by chance, they would not even known they had done so. -- Xenophanes

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Re: [FFmpeg-devel] [PATCH 2/6] avcodec/wavarc: Fix integer overflwo in do_stereo()

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 728 bytes --]

On Thu, Sep 21, 2023 at 08:09:08PM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 148676193 - -2006512262 cannot be represented in type 'int'
> Fixes: 62164/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVARC_fuzzer-5963163952349184
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/wavarc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

will apply the 3 wavarc patches from this set

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No snowflake in an avalanche ever feels responsible. -- Voltaire

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