[FFmpeg-devel] [PATCH 1/2] avformat/avr: Check sample rate

[FFmpeg-devel] [PATCH 1/2] avformat/avr: Check sample rate

[Michael Niedermayer]

Fixes: 54979/clusterfuzz-testcase-minimized-ffmpeg_dem_AVR_fuzzer-6681035461230592
Fixes: Timeout

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

diff --git a/libavformat/avr.c b/libavformat/avr.c
index 1cc4d56bfb..3fe8614b25 100644
--- a/libavformat/avr.c
+++ b/libavformat/avr.c
@@ -75,6 +75,9 @@ static int avr_read_header(AVFormatContext *s)
     avio_skip(s->pb, 20);
     avio_skip(s->pb, 64);
 
+    if (st->codecpar->sample_rate == 0)
+        return AVERROR_INVALIDDATA;
+
     st->codecpar->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign);
     if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
         avpriv_request_sample(s, "Bps %d and sign %d", bps, sign);
-- 
2.17.1

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[FFmpeg-devel] [PATCH 2/2] tools/target_dec_fuzzer: Adjust threshold for jpeg2000

[Michael Niedermayer]

Fixes: Timeout
Fixes: 57385/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5394334324490240

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

diff --git a/tools/target_dec_fuzzer.c b/tools/target_dec_fuzzer.c
index 165951dc9d..10c380ef1c 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -247,7 +247,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     case AV_CODEC_ID_IFF_ILBM:    maxpixels  /= 128;   break;
     case AV_CODEC_ID_INDEO4:      maxpixels  /= 128;   break;
     case AV_CODEC_ID_INTERPLAY_ACM: maxsamples /= 16384;  break;
-    case AV_CODEC_ID_JPEG2000:    maxpixels  /= 4096;  break;
+    case AV_CODEC_ID_JPEG2000:    maxpixels  /= 16384; break;
     case AV_CODEC_ID_LAGARITH:    maxpixels  /= 1024;  break;
     case AV_CODEC_ID_LOCO:        maxpixels  /= 1024;  break;
     case AV_CODEC_ID_VORBIS:      maxsamples /= 1024;  break;
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH 2/2] tools/target_dec_fuzzer: Adjust threshold for jpeg2000

[Michael Niedermayer]

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On Sun, Jul 23, 2023 at 01:46:21AM +0200, Michael Niedermayer wrote:
> Fixes: Timeout
> Fixes: 57385/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5394334324490240
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  tools/target_dec_fuzzer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

will apply

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Re: [FFmpeg-devel] [PATCH 1/2] avformat/avr: Check sample rate

[Andreas Rheinhardt]

Michael Niedermayer:
> Fixes: 54979/clusterfuzz-testcase-minimized-ffmpeg_dem_AVR_fuzzer-6681035461230592
> Fixes: Timeout
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavformat/avr.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/libavformat/avr.c b/libavformat/avr.c
> index 1cc4d56bfb..3fe8614b25 100644
> --- a/libavformat/avr.c
> +++ b/libavformat/avr.c
> @@ -75,6 +75,9 @@ static int avr_read_header(AVFormatContext *s)
>      avio_skip(s->pb, 20);
>      avio_skip(s->pb, 64);
>  
> +    if (st->codecpar->sample_rate == 0)
> +        return AVERROR_INVALIDDATA;
> +
>      st->codecpar->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign);
>      if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
>          avpriv_request_sample(s, "Bps %d and sign %d", bps, sign);

Why don't you check this directly after having read the sample rate?
That way the value would still be in a register.

- Andreas

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Re: [FFmpeg-devel] [PATCH 1/2] avformat/avr: Check sample rate

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 1507 bytes --]

On Tue, Aug 01, 2023 at 12:55:49PM +0200, Andreas Rheinhardt wrote:
> Michael Niedermayer:
> > Fixes: 54979/clusterfuzz-testcase-minimized-ffmpeg_dem_AVR_fuzzer-6681035461230592
> > Fixes: Timeout
> > 
> > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavformat/avr.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/libavformat/avr.c b/libavformat/avr.c
> > index 1cc4d56bfb..3fe8614b25 100644
> > --- a/libavformat/avr.c
> > +++ b/libavformat/avr.c
> > @@ -75,6 +75,9 @@ static int avr_read_header(AVFormatContext *s)
> >      avio_skip(s->pb, 20);
> >      avio_skip(s->pb, 64);
> >  
> > +    if (st->codecpar->sample_rate == 0)
> > +        return AVERROR_INVALIDDATA;
> > +
> >      st->codecpar->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign);
> >      if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
> >          avpriv_request_sample(s, "Bps %d and sign %d", bps, sign);
> 
> Why don't you check this directly after having read the sample rate?
> That way the value would still be in a register.

that would be cleaner too, I will apply it with that change

thx

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