nutdec: check that filesize is valid before using it.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
13 years ago · 9d230ba924
parent b12e61ac7f
commit 9d230ba924
1 changed files with 3 additions and 0 deletions
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@ -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) {