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avformat/assdec: make sure pos is initialized 

Fixes use of uninitialized memory
Fixes: signal_sigsegv_504fb0_10_signal_sigsegv_504fb0_343_mewmew_ssa.avi

Found-by: Mateusz j00ru Jurczyk and Gynvael Coldwind
This commit is contained in:
Clément Bœsch 2014-10-04 12:22:37 +02:00
parent dceebe1a60
commit 138902dfb6
1 changed files with 2 additions and 2 deletions
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4
libavformat/assdec.c
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@ -57,14 +57,14 @@ static int ass_read_close(AVFormatContext *s)
static int read_dialogue(ASSContext *ass, AVBPrint *dst, const uint8_t *p,
int64_t *start, int *duration)
{
int pos;
int pos = 0;
int64_t end;
int hh1, mm1, ss1, ms1;
int hh2, mm2, ss2, ms2;
if (sscanf(p, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n",
&hh1, &mm1, &ss1, &ms1,
&hh2, &mm2, &ss2, &ms2, &pos) >= 8) {
&hh2, &mm2, &ss2, &ms2, &pos) >= 8 && pos > 0) {
/* This is not part of the sscanf itself in order to handle an actual
* number (which would be the Layer) or the form "Marked=N" (which is