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avformat/asfdec_f: Check name_len for overflow 

Fixes: signed integer overflow: -1172299744 * 2 cannot be represented in type 'int'
Fixes: 26258/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5672758488596480

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 2020-10-15 22:04:56 +02:00
parent d198362839
commit 0d088a47ca
1 changed files with 2 additions and 0 deletions
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2
libavformat/asfdec_f.c
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@ -769,6 +769,8 @@ static int asf_read_marker(AVFormatContext *s, int64_t size)
avio_rl32(pb); // send time
avio_rl32(pb); // flags
name_len = avio_rl32(pb); // name length
if ((unsigned)name_len > INT_MAX / 2)
return AVERROR_INVALIDDATA;
if ((ret = avio_get_str16le(pb, name_len * 2, name,
sizeof(name))) < name_len)
avio_skip(pb, name_len - ret);