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avformat/asfdec_f: Check amount of value read

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Fixes: use of uninitialized memory
Fixes: 403675492/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_fuzzer-4754281823797248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit fa197924a6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-07-23 01:57:54 +02:00
parent 206a89d4b0
commit cb57b6ee15
1 changed files with 4 additions and 2 deletions
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6
libavformat/asfdec_f.c
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@@ -239,8 +239,10 @@ static void get_tag(AVFormatContext *s, const char *key, int type, int len, int
case ASF_UNICODE:
avio_get_str16le(s->pb, len, value, 2 * len + 1);
break;
case -1: // ASCI
avio_read(s->pb, value, len);
case -1:; // ASCII
int ret = ffio_read_size(s->pb, value, len);
if (ret < 0)
goto finish;
value[len]=0;
break;
case ASF_BYTE_ARRAY: