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avcodec/cbs_jpeg: Check length for SOS
Fixes: out of array access Fixes: 19734/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5673507031875584 Fixes: 19353/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5703944462663680 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Diff for: libavcodec/cbs_jpeg.c

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@@ -197,6 +197,9 @@ static int cbs_jpeg_split_fragment(CodedBitstreamContext *ctx,
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if (marker == JPEG_MARKER_SOS) {
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length = AV_RB16(frag->data + start);
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if (length > end - start)
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return AVERROR_INVALIDDATA;
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data_ref = NULL;
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data = av_malloc(end - start +
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AV_INPUT_BUFFER_PADDING_SIZE);

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