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avcodec/mxpegdec: Check for AVDISCARD_ALL 

Fixes: Fixes NULL pointer dereference
Fixes: 36610/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MXPEG_fuzzer-6052641783283712
Fixes: 37907/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MXPEG_fuzzer-4725170850365440
Fixes: 37904/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MXPEG_fuzzer-6367889262247936
Fixes: 38085/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MXPEG_fuzzer-5175270823297024

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-09-14 20:16:27 +02:00
parent 991b3deea9
commit 20afd3a63a
1 changed files with 3 additions and 0 deletions
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3
libavcodec/mxpegdec.c
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@ -193,6 +193,9 @@ static int mxpeg_decode_frame(AVCodecContext *avctx,
int start_code;
int ret;
if (avctx->skip_frame == AVDISCARD_ALL)
return AVERROR_PATCHWELCOME;
buf_ptr = buf;
buf_end = buf + buf_size;
jpg->got_picture = 0;