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avformat/mov: Extend data_size check in mov_read_udta_string() 

Fixes: signed integer overflow: -2147483634 - 16 cannot be represented in type 'int'
Fixes: 28322/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5711888402612224

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 2020-12-13 00:08:46 +01:00
parent bcc7d14453
commit 74c4c53953
1 changed files with 1 additions and 1 deletions
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2
libavformat/mov.c
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@ -404,7 +404,7 @@ retry:
if (c->itunes_metadata && atom.size > 8) { if (c->itunes_metadata && atom.size > 8) {
int data_size = avio_rb32(pb); int data_size = avio_rb32(pb);
int tag = avio_rl32(pb); int tag = avio_rl32(pb);
if (tag == MKTAG('d','a','t','a') && data_size <= atom.size) { if (tag == MKTAG('d','a','t','a') && data_size <= atom.size && data_size >= 16) {
data_type = avio_rb32(pb); // type data_type = avio_rb32(pb); // type
avio_rb32(pb); // unknown avio_rb32(pb); // unknown
str_size = data_size - 16; str_size = data_size - 16;