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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-03 12:20:14 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-25 00:07:07 +0100 |
| commit | 75b64e5aa36e7796a0460415a1f3fd7372029525 (patch) | |
| tree | 774b1b000c5802766aaf2023dfd5adc2cffa24b8 | |
| parent | 1138cdecbe0164ab1f07768418e794fddfdc636d (diff) | |
| download | ffmpeg-75b64e5aa36e7796a0460415a1f3fd7372029525.tar.gz | |
avcodec/mxpegdec: Check for multiple SOF
Fixes: Timeout (14sec -> 9ms)
Fixes: 18598/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MXPEG_fuzzer-5726095261564928
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/mxpegdec.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/libavcodec/mxpegdec.c b/libavcodec/mxpegdec.c index 2e3ebe6e70..55ec6e928e 100644 --- a/libavcodec/mxpegdec.c +++ b/libavcodec/mxpegdec.c @@ -199,6 +199,7 @@ static int mxpeg_decode_frame(AVCodecContext *avctx, buf_end = buf + buf_size; jpg->got_picture = 0; s->got_mxm_bitmask = 0; + s->got_sof_data = !!s->got_sof_data; while (buf_ptr < buf_end) { start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end, &unescaped_buf_ptr, &unescaped_buf_size); @@ -241,6 +242,11 @@ static int mxpeg_decode_frame(AVCodecContext *avctx, return ret; break; case SOF0: + if (s->got_sof_data > 1) { + av_log(avctx, AV_LOG_ERROR, + "Multiple SOF in a frame\n"); + return AVERROR_INVALIDDATA; + } s->got_sof_data = 0; ret = ff_mjpeg_decode_sof(jpg); if (ret < 0) { @@ -253,7 +259,7 @@ static int mxpeg_decode_frame(AVCodecContext *avctx, "Interlaced mode not supported in MxPEG\n"); return AVERROR(EINVAL); } - s->got_sof_data = 1; + s->got_sof_data ++; break; case SOS: if (!s->got_sof_data) { |