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avformat/img2dec: fix infinite loop 

Fixes: kira-poc

Found-by: Kira <kira_cxy@foxmail.com>
Change suggested by Kira
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-03-10 01:40:36 +01:00
parent f655ddfb47
commit a6cba06205
1 changed files with 5 additions and 1 deletions
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6
libavformat/img2dec.c
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@ -878,10 +878,14 @@ static int svg_probe(AVProbeData *p)
{
const uint8_t *b = p->buf;
const uint8_t *end = p->buf + p->buf_size;
if (memcmp(p->buf, "<?xml", 5))
return 0;
while (b < end) {
b += ff_subtitles_next_line(b);
int inc = ff_subtitles_next_line(b);
if (!inc)
break;
b += inc;
if (b >= end - 4)
return 0;
if (!memcmp(b, "<svg", 4))