[FFmpeg-devel] [PATCH 1/3] tools/target_dec_fuzzer: Adjust threshold for CFHD

[FFmpeg-devel] [PATCH 1/3] tools/target_dec_fuzzer: Adjust threshold for CFHD

[Michael Niedermayer]

Fixes: Timeout
Fixes: 46504/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-6376835606249472

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 fefc8514f0..9a4e2136eb 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -211,7 +211,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     case AV_CODEC_ID_AGM:         maxpixels  /= 1024;  break;
     case AV_CODEC_ID_ARBC:        maxpixels  /= 1024;  break;
     case AV_CODEC_ID_BINKVIDEO:   maxpixels  /= 32;    break;
-    case AV_CODEC_ID_CFHD:        maxpixels  /= 128;   break;
+    case AV_CODEC_ID_CFHD:        maxpixels  /= 16384; break;
     case AV_CODEC_ID_COOK:        maxsamples /= 1<<20; break;
     case AV_CODEC_ID_DFA:         maxpixels  /= 1024;  break;
     case AV_CODEC_ID_DIRAC:       maxpixels  /= 8192;  break;
-- 
2.17.1

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[FFmpeg-devel] [PATCH 2/3] tools/target_dec_fuzzer: Adjust threshold for MVC2

[Michael Niedermayer]

Fixes: Timeout
Fixes: 48689/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVC2_fuzzer-6436301427048448

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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/target_dec_fuzzer.c b/tools/target_dec_fuzzer.c
index 9a4e2136eb..adafc977e4 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -245,6 +245,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     case AV_CODEC_ID_MSRLE:       maxpixels  /= 16;    break;
     case AV_CODEC_ID_MSS2:        maxpixels  /= 16384; break;
     case AV_CODEC_ID_MSZH:        maxpixels  /= 128;   break;
+    case AV_CODEC_ID_MVC2:        maxpixels  /= 128;   break;
     case AV_CODEC_ID_MXPEG:       maxpixels  /= 128;   break;
     case AV_CODEC_ID_OPUS:        maxsamples /= 16384; break;
     case AV_CODEC_ID_PNG:         maxpixels  /= 128;   break;
-- 
2.17.1

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[FFmpeg-devel] [PATCH 3/3] avformat/iff: simplify duration calculation

[Michael Niedermayer]

Fixes: signed integer overflow: 315680096256 * 134215943 cannot be represented in type 'long long'
Fixes: 48713/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5886272312311808

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/iff.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavformat/iff.c b/libavformat/iff.c
index 3c861ef34d..b37600605a 100644
--- a/libavformat/iff.c
+++ b/libavformat/iff.c
@@ -384,7 +384,7 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
                 avio_skip(pb, 1);
             pkt->flags |= AV_PKT_FLAG_KEY;
             pkt->stream_index = 0;
-            pkt->duration = 588LL * s->streams[0]->codecpar->sample_rate / 44100;
+            pkt->duration = s->streams[0]->codecpar->sample_rate / 75;
             pkt->pos = chunk_pos;
 
             chunk_pos = avio_tell(pb);
@@ -397,7 +397,8 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
         case ID_FRTE:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
-            s->streams[0]->duration = avio_rb32(pb) * 588LL * s->streams[0]->codecpar->sample_rate / 44100;
+            s->streams[0]->duration = avio_rb32(pb) * (uint64_t)s->streams[0]->codecpar->sample_rate / 75;
+
             break;
         }
 
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH 1/3] tools/target_dec_fuzzer: Adjust threshold for CFHD

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 664 bytes --]

On Tue, Jul 05, 2022 at 12:30:32AM +0200, Michael Niedermayer wrote:
> Fixes: Timeout
> Fixes: 46504/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-6376835606249472
> 
> 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

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

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 

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Re: [FFmpeg-devel] [PATCH 2/3] tools/target_dec_fuzzer: Adjust threshold for MVC2

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 609 bytes --]

On Tue, Jul 05, 2022 at 12:30:33AM +0200, Michael Niedermayer wrote:
> Fixes: Timeout
> Fixes: 48689/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVC2_fuzzer-6436301427048448
> 
> 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 | 1 +
>  1 file changed, 1 insertion(+)

will apply

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

Democracy is the form of government in which you can choose your dictator

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Re: [FFmpeg-devel] [PATCH 3/3] avformat/iff: simplify duration calculation

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 767 bytes --]

On Tue, Jul 05, 2022 at 12:30:34AM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 315680096256 * 134215943 cannot be represented in type 'long long'
> Fixes: 48713/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5886272312311808
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavformat/iff.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

will apply

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

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact

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