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[FFmpeg-devel,2/8] avformat/mpeg: Check an avio_read() for failure

Message ID 20240804205309.1978196-2-michael@niedermayer.cc
State New
Headers show
Series [FFmpeg-devel,1/8] avcodec/apac: Clean padding space | expand

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Commit Message

Michael Niedermayer Aug. 4, 2024, 8:53 p.m. UTC 
Fixes: use-of-uninitialized-value
Fixes: 70849/clusterfuzz-testcase-minimized-ffmpeg_dem_MPEGPS_fuzzer-4684401009557504

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mpeg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index c3dff3e4ea2..262e398fa5e 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -566,7 +566,9 @@  redo:
         static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
         unsigned char buf[8];
 
-        avio_read(s->pb, buf, 8);
+        ret = avio_read(s->pb, buf, 8);
+        if (ret < 0)
+            return ret;
         avio_seek(s->pb, -8, SEEK_CUR);
         if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
             codec_id = AV_CODEC_ID_CAVS;