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nutdec: check that filesize is valid before using it.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-06-30 17:01:59 +02:00
parent b12e61ac7f
commit 9d230ba924
1 changed files with 3 additions and 0 deletions
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3
libavformat/nutdec.c
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@ -562,6 +562,9 @@ static int find_and_decode_index(NUTContext *nut)
int8_t *has_keyframe;
int ret = -1;
if(filesize <= 0)
return -1;
avio_seek(bc, filesize - 12, SEEK_SET);
avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
if (avio_rb64(bc) != INDEX_STARTCODE) {