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avcodec/sanm: Check w,h,left,top

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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>
(cherry picked from commit 134fbfd1dc)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-08-17 15:31:48 +02:00
parent 5cd1f52f68
commit 5c11cf98ab
1 changed files with 5 additions and 0 deletions
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5
libavcodec/sanm.c
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@@ -974,6 +974,11 @@ static int process_frame_obj(SANMVideoContext *ctx)
}
bytestream2_skip(&ctx->gb, 4);
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: