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| author | Michael Niedermayer <michael@niedermayer.cc> | 2025-08-17 15:31:48 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2025-08-17 15:39:33 +0200 |
| commit | 134fbfd1dcb59441e38d870ddd231772f4e8e127 (patch) | |
| tree | 4055e8d44af17ec719afc537b2f748aee619387f | |
| parent | a2cfaf1b916cd4519249031adc37e339baca7a7b (diff) | |
| download | ffmpeg-134fbfd1dcb59441e38d870ddd231772f4e8e127.tar.gz | |
avcodec/sanm: Check w,h,left,top
The setup code fow w,h,left,top is complex, the code using it also falls in
at least 2 different classes, one using left/top the other not.
To ensure no out of array access happens we add this clear check.
Fixes: out of array access
Fixes: 439261995/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SANM_fuzzer-5383455572819968
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/sanm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c index a066a864eb..9e99aa9dd9 100644 --- a/libavcodec/sanm.c +++ b/libavcodec/sanm.c @@ -1757,6 +1757,11 @@ static int process_frame_obj(SANMVideoContext *ctx, GetByteContext *gb) memset(ctx->fbuf, 0, ctx->frm0_size); } + if (w + FFMAX(left, 0) > ctx->avctx->width || h + FFMAX(top, 0) > ctx->avctx->height) { + avpriv_request_sample(ctx->avctx, "overly large frame\n"); + return AVERROR_PATCHWELCOME; + } + switch (codec) { case 1: case 3: |