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avformat/avidec: Check read_odml_index() for failure 

Fixes: Timeout
Fixes: 40950/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-6478873068437504

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 2021-11-14 18:23:24 +01:00
parent ff23cee200
commit 57adb26d05
1 changed files with 5 additions and 2 deletions
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7
libavformat/avidec.c
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@ -240,6 +240,8 @@ static int read_odml_index(AVFormatContext *s, int64_t frame_num)
} else {
int64_t offset, pos;
int duration;
int ret;
offset = avio_rl64(pb);
avio_rl32(pb); /* size */
duration = avio_rl32(pb);
@ -257,7 +259,7 @@ static int read_odml_index(AVFormatContext *s, int64_t frame_num)
if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
return -1;
avi->odml_depth++;
read_odml_index(s, frame_num);
ret = read_odml_index(s, frame_num);
avi->odml_depth--;
frame_num += duration;
@ -265,7 +267,8 @@ static int read_odml_index(AVFormatContext *s, int64_t frame_num)
av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
return -1;
}
if (ret < 0)
return ret;
}
}
avi->index_loaded = 2;