[FFmpeg-devel] [PATCH 1/3] avcodec/evc_ps: Check chroma_format_idc

[FFmpeg-devel] [PATCH 1/3] avcodec/evc_ps: Check chroma_format_idc

[Michael Niedermayer]

Fixes: out of array access
Fixes: 62678/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4858264984354816

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

diff --git a/libavcodec/evc_ps.c b/libavcodec/evc_ps.c
index c11b92d1c5..19895d404d 100644
--- a/libavcodec/evc_ps.c
+++ b/libavcodec/evc_ps.c
@@ -179,6 +179,10 @@ int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets *ps)
     // 2 - 4:2:2
     // 3 - 4:4:4
     sps->chroma_format_idc = get_ue_golomb_31(gb);
+    if (sps->chroma_format_idc > 3) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
 
     sps->pic_width_in_luma_samples = get_ue_golomb_long(gb);
     sps->pic_height_in_luma_samples = get_ue_golomb_long(gb);
-- 
2.17.1

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[FFmpeg-devel] [PATCH 2/3] avcodec/evc_parse: remove pow() and log2()

[Michael Niedermayer]

The use of float based functions is both unneeded and wrong due to unpredictable rounding

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/evc_parse.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c
index bd3a4416f2..255706ce61 100644
--- a/libavcodec/evc_parse.c
+++ b/libavcodec/evc_parse.c
@@ -172,7 +172,8 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh,
             poc->PicOrderCntVal = 0;
             poc->DocOffset = -1;
         } else {
-            int SubGopLength = (int)pow(2.0, sps->log2_sub_gop_length);
+            int SubGopLength = 1 << sps->log2_sub_gop_length;
+
             if (tid == 0) {
                 poc->PicOrderCntVal = poc->prevPicOrderCntVal + SubGopLength;
                 poc->DocOffset = 0;
@@ -187,15 +188,16 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh,
                     poc->prevPicOrderCntVal += SubGopLength;
                     ExpectedTemporalId = 0;
                 } else
-                    ExpectedTemporalId = 1 + (int)log2(poc->DocOffset);
+                    ExpectedTemporalId = 1 + av_log2(poc->DocOffset);
+
                 while (tid != ExpectedTemporalId) {
                     poc->DocOffset = (poc->DocOffset + 1) % SubGopLength;
                     if (poc->DocOffset == 0)
                         ExpectedTemporalId = 0;
                     else
-                        ExpectedTemporalId = 1 + (int)log2(poc->DocOffset);
+                        ExpectedTemporalId = 1 + av_log2(poc->DocOffset);
                 }
-                PocOffset = (int)(SubGopLength * ((2.0 * poc->DocOffset + 1) / (int)pow(2.0, tid) - 2));
+                PocOffset = (int)(SubGopLength * ((2.0 * poc->DocOffset + 1) / (1 << tid) - 2));
                 poc->PicOrderCntVal = poc->prevPicOrderCntVal + PocOffset;
             }
         }
-- 
2.17.1

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[FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid

[Michael Niedermayer]

The check is based on not infinite looping. It is likely
a more strict check can be done

Fixes: Infinite loop
Fixes: 62473/clusterfuzz-testcase-minimized-ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
Fixes: 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-6448531252314112

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

diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c
index 255706ce61..43b8dabf8b 100644
--- a/libavcodec/evc_parse.c
+++ b/libavcodec/evc_parse.c
@@ -174,6 +174,9 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh,
         } else {
             int SubGopLength = 1 << sps->log2_sub_gop_length;
 
+            if (tid > (SubGopLength > 1 ? 1 + av_log2(SubGopLength - 1) : 0))
+                return AVERROR_INVALIDDATA;
+
             if (tid == 0) {
                 poc->PicOrderCntVal = poc->prevPicOrderCntVal + SubGopLength;
                 poc->DocOffset = 0;
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH 1/3] avcodec/evc_ps: Check chroma_format_idc

[Kieran Kunhya]

On Fri, 13 Oct 2023 at 00:28, Michael Niedermayer <michael@niedermayer.cc>
wrote:

> Fixes: out of array access
> Fixes:
> 62678/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4858264984354816
>
> 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/evc_ps.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/libavcodec/evc_ps.c b/libavcodec/evc_ps.c
> index c11b92d1c5..19895d404d 100644
> --- a/libavcodec/evc_ps.c
> +++ b/libavcodec/evc_ps.c
> @@ -179,6 +179,10 @@ int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets
> *ps)
>      // 2 - 4:2:2
>      // 3 - 4:4:4
>      sps->chroma_format_idc = get_ue_golomb_31(gb);
> +    if (sps->chroma_format_idc > 3) {
> +        ret = AVERROR_INVALIDDATA;
> +        goto fail;
> +    }
>
>      sps->pic_width_in_luma_samples = get_ue_golomb_long(gb);
>      sps->pic_height_in_luma_samples = get_ue_golomb_long(gb);
> --
> 2.17.1
>

ok
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Re: [FFmpeg-devel] [PATCH 1/3] avcodec/evc_ps: Check chroma_format_idc

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 1604 bytes --]

On Fri, Oct 13, 2023 at 01:18:27AM +0100, Kieran Kunhya wrote:
> On Fri, 13 Oct 2023 at 00:28, Michael Niedermayer <michael@niedermayer.cc>
> wrote:
> 
> > Fixes: out of array access
> > Fixes:
> > 62678/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4858264984354816
> >
> > 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/evc_ps.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/libavcodec/evc_ps.c b/libavcodec/evc_ps.c
> > index c11b92d1c5..19895d404d 100644
> > --- a/libavcodec/evc_ps.c
> > +++ b/libavcodec/evc_ps.c
> > @@ -179,6 +179,10 @@ int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets
> > *ps)
> >      // 2 - 4:2:2
> >      // 3 - 4:4:4
> >      sps->chroma_format_idc = get_ue_golomb_31(gb);
> > +    if (sps->chroma_format_idc > 3) {
> > +        ret = AVERROR_INVALIDDATA;
> > +        goto fail;
> > +    }
> >
> >      sps->pic_width_in_luma_samples = get_ue_golomb_long(gb);
> >      sps->pic_height_in_luma_samples = get_ue_golomb_long(gb);
> > --
> > 2.17.1
> >
> 
> ok

will apply

thx

[...]
-- 
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If you fake or manipulate statistics in a paper in physics you will never
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Re: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid

[Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Michael Niedermayer
> Sent: piątek, 13 października 2023 01:28
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid
> 
> The check is based on not infinite looping. It is likely a more strict
check can be
> done
> 
> Fixes: Infinite loop
> Fixes: 62473/clusterfuzz-testcase-minimized-
> ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
> Fixes: 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-
> 6448531252314112
> 
> Found-by: continuous fuzzing process
> https://protect2.fireeye.com/v1/url?k=06e4faf3-676fefea-06e571bc-
> 74fe485cbfec-11816a289a0e9c00&q=1&e=16696cd9-38c1-42d0-9196-
> 8ad7c6d1d0d6&u=https%3A%2F%2Fgithub.com%2Fgoogle%2Foss-
> fuzz%2Ftree%2Fmaster%2Fprojects%2Fffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/evc_parse.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c index
> 255706ce61..43b8dabf8b 100644
> --- a/libavcodec/evc_parse.c
> +++ b/libavcodec/evc_parse.c
> @@ -174,6 +174,9 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const
> EVCParserSliceHeader *sh,
>          } else {
>              int SubGopLength = 1 << sps->log2_sub_gop_length;
> 
> +            if (tid > (SubGopLength > 1 ? 1 + av_log2(SubGopLength - 1) :
0))
> +                return AVERROR_INVALIDDATA;
> +
>              if (tid == 0) {
>                  poc->PicOrderCntVal = poc->prevPicOrderCntVal +
SubGopLength;
>                  poc->DocOffset = 0;
> --
> 2.17.1
> 
int SubGopLength = 1 << sps->log2_sub_gop_length;
if (tid > 1 + av_log2(SubGopLength - 1))
	return AVERROR_INVALIDDATA;

For the value of SubGopLength = 1 ( if sps->log2_sub_gop_length  = 0; "The
value of log2_sub_gop_length shall be in the range of 0 to 5, inclusive" -
ISO_IEC_23094-1-2020 7.4.3.1), we have av_log2(0). The value of the
logarithm of 0 with any base (in this case, log2) is minus infinity (-inf)

Perhaps we should consider changing the condition to:
if (tid < 0 || tid > av_log2(SubGopLength))
                return AVERROR_INVALIDDATA;
> _______________________________________________
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> ffmpeg-devel@ffmpeg.org
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> 8ad7c6d1d0d6&u=https%3A%2F%2Fffmpeg.org%2Fmailman%2Flistinfo%2Fffmp
> eg-devel
> 
> To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org
> with subject "unsubscribe".


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Re: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid

[Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Michael Niedermayer
> Sent: piątek, 13 października 2023 01:28
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid
> 
> The check is based on not infinite looping. It is likely a more strict
check can be
> done
> 
> Fixes: Infinite loop
> Fixes: 62473/clusterfuzz-testcase-minimized-
> ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
> Fixes: 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-
> 6448531252314112
> 
> Found-by: continuous fuzzing process
> https://protect2.fireeye.com/v1/url?k=06e4faf3-676fefea-06e571bc-
> 74fe485cbfec-11816a289a0e9c00&q=1&e=16696cd9-38c1-42d0-9196-
> 8ad7c6d1d0d6&u=https%3A%2F%2Fgithub.com%2Fgoogle%2Foss-
> fuzz%2Ftree%2Fmaster%2Fprojects%2Fffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/evc_parse.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c index
> 255706ce61..43b8dabf8b 100644
> --- a/libavcodec/evc_parse.c
> +++ b/libavcodec/evc_parse.c
> @@ -174,6 +174,9 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const
> EVCParserSliceHeader *sh,
>          } else {
>              int SubGopLength = 1 << sps->log2_sub_gop_length;
> 
> +            if (tid > (SubGopLength > 1 ? 1 + av_log2(SubGopLength - 1) :
0))
> +                return AVERROR_INVALIDDATA;
> +
>              if (tid == 0) {
>                  poc->PicOrderCntVal = poc->prevPicOrderCntVal +
SubGopLength;
>                  poc->DocOffset = 0;
> --
> 2.17.1
> 
My previous comment was related to a different patchset ([FFmpeg-devel,4/4]
avcodec/evc_parse: Check tid) 
I apologize for the mistake

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> 8ad7c6d1d0d6&u=https%3A%2F%2Fffmpeg.org%2Fmailman%2Flistinfo%2Fffmp
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> 
> To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org
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Re: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid

[Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Michael Niedermayer
> Sent: piątek, 13 października 2023 01:28
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid
> 
> The check is based on not infinite looping. It is likely a more strict
check can be
> done
> 
> Fixes: Infinite loop
> Fixes: 62473/clusterfuzz-testcase-minimized-
> ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
> Fixes: 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-
> 6448531252314112
> 
> Found-by: continuous fuzzing process
> https://protect2.fireeye.com/v1/url?k=06e4faf3-676fefea-06e571bc-
> 74fe485cbfec-11816a289a0e9c00&q=1&e=16696cd9-38c1-42d0-9196-
> 8ad7c6d1d0d6&u=https%3A%2F%2Fgithub.com%2Fgoogle%2Foss-
> fuzz%2Ftree%2Fmaster%2Fprojects%2Fffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/evc_parse.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c index
> 255706ce61..43b8dabf8b 100644
> --- a/libavcodec/evc_parse.c
> +++ b/libavcodec/evc_parse.c
> @@ -174,6 +174,9 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const
> EVCParserSliceHeader *sh,
>          } else {
>              int SubGopLength = 1 << sps->log2_sub_gop_length;
> 
> +            if (tid > (SubGopLength > 1 ? 1 + av_log2(SubGopLength - 1) :
0))
> +                return AVERROR_INVALIDDATA;
> +
>              if (tid == 0) {
>                  poc->PicOrderCntVal = poc->prevPicOrderCntVal +
SubGopLength;
>                  poc->DocOffset = 0;
> --


Looks good

> 2.17.1
> 
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> 8ad7c6d1d0d6&u=https%3A%2F%2Fffmpeg.org%2Fmailman%2Flistinfo%2Fffmp
> eg-devel
> 
> To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org
> with subject "unsubscribe".


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Re: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 2171 bytes --]

On Fri, Oct 27, 2023 at 03:02:27PM +0200, Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics wrote:
> 
> 
> 
> 
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> > Michael Niedermayer
> > Sent: piątek, 13 października 2023 01:28
> > To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> > Subject: [FFmpeg-devel] [PATCH 3/3] avcodec/evc_parse: Check tid
> > 
> > The check is based on not infinite looping. It is likely a more strict
> check can be
> > done
> > 
> > Fixes: Infinite loop
> > Fixes: 62473/clusterfuzz-testcase-minimized-
> > ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5719883750703104
> > Fixes: 62765/clusterfuzz-testcase-minimized-ffmpeg_dem_EVC_fuzzer-
> > 6448531252314112
> > 
> > Found-by: continuous fuzzing process
> > https://protect2.fireeye.com/v1/url?k=06e4faf3-676fefea-06e571bc-
> > 74fe485cbfec-11816a289a0e9c00&q=1&e=16696cd9-38c1-42d0-9196-
> > 8ad7c6d1d0d6&u=https%3A%2F%2Fgithub.com%2Fgoogle%2Foss-
> > fuzz%2Ftree%2Fmaster%2Fprojects%2Fffmpeg
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavcodec/evc_parse.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c index
> > 255706ce61..43b8dabf8b 100644
> > --- a/libavcodec/evc_parse.c
> > +++ b/libavcodec/evc_parse.c
> > @@ -174,6 +174,9 @@ int ff_evc_derive_poc(const EVCParamSets *ps, const
> > EVCParserSliceHeader *sh,
> >          } else {
> >              int SubGopLength = 1 << sps->log2_sub_gop_length;
> > 
> > +            if (tid > (SubGopLength > 1 ? 1 + av_log2(SubGopLength - 1) :
> 0))
> > +                return AVERROR_INVALIDDATA;
> > +
> >              if (tid == 0) {
> >                  poc->PicOrderCntVal = poc->prevPicOrderCntVal +
> SubGopLength;
> >                  poc->DocOffset = 0;
> > --
> 
> 
> Looks good

will apply

thx

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

The educated differ from the uneducated as much as the living from the
dead. -- Aristotle 

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