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avcodec/mjpegbdec: Skip SOS on AVDISCARD_ALL as does mjpeg 

Fixes: NULL pointer dereference
Fixes: 36342/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEGB_fuzzer-4579188072906752
Fixes: 36344/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEGB_fuzzer-5049579300061184
Fixes: 36345/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEGB_fuzzer-5301149845553152
Fixes: 36374/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEGB_fuzzer-6056312352931840

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 2021-08-22 21:57:28 +02:00
parent 909faca929
commit 104a8399ae
1 changed files with 7 additions and 3 deletions
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10
libavcodec/mjpegbdec.c
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@ -119,9 +119,13 @@ read_header:
8 * FFMIN(field_size, buf_end - buf_ptr - sos_offs));
s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
s->start_code = SOS;
ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL);
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
return ret;
if (avctx->skip_frame == AVDISCARD_ALL) {
skip_bits(&s->gb, get_bits_left(&s->gb));
} else {
ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL);
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
return ret;
}
}
if (s->interlaced) {