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Force gif aspect ratio multiplication to 64bit. 

Avoids a possible integer overflow.
This commit is contained in:
Carl Eugen Hoyos 2014-04-05 01:13:47 +02:00
parent b6850e132f
commit 87f2999641
1 changed files with 3 additions and 2 deletions
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5
libavformat/gif.c
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@ -33,10 +33,11 @@ static int gif_image_write_header(AVFormatContext *s, int width, int height,
{
AVIOContext *pb = s->pb;
AVRational sar = s->streams[0]->codec->sample_aspect_ratio;
int i, aspect = 0;
int i;
int64_t aspect = 0;
if (sar.num > 0 && sar.den > 0) {
aspect = sar.num * 64 / sar.den - 15;
aspect = sar.num * 64LL / sar.den - 15;
if (aspect < 0 || aspect > 255)
aspect = 0;
}