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avformat/swfdec: clear 4 bytes at the end of a packet if they are not initialized

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Fixes use of uninitialized memory
Fixes part of msan_uninit-mem_7f055dd0ab1b_9558_videopop_guitar_300k.swf
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-12-19 04:38:16 +01:00
parent e72f5abbc6
commit f5d039840a
1 changed files with 1 additions and 0 deletions
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libavformat/swfdec.c
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@ -455,6 +455,7 @@ bitmap_end_skip:
/* old SWF files containing SOI/EOI as data start */
/* files created by swink have reversed tag */
pkt->size -= 4;
memset(pkt->data+pkt->size, 0, 4);
res = avio_read(pb, pkt->data, pkt->size);
} else {
res = avio_read(pb, pkt->data + 4, pkt->size - 4);