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avcodec/ansi: Check x/y 

This prevents out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-02 02:15:03 +02:00
parent c1f2c4c3b4
commit e91fd754c6
1 changed files with 4 additions and 0 deletions
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4
libavcodec/ansi.c
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@ -243,6 +243,8 @@ static int execute_code(AVCodecContext * avctx, int c)
default:
avpriv_request_sample(avctx, "Unsupported screen mode");
}
s->x = av_clip(s->x, 0, width - FONT_WIDTH);
s->y = av_clip(s->y, 0, height - s->font_height);
if (width != avctx->width || height != avctx->height) {
av_frame_unref(s->frame);
avcodec_set_dimensions(avctx, width, height);
@ -336,6 +338,8 @@ static int execute_code(AVCodecContext * avctx, int c)
avpriv_request_sample(avctx, "Unknown escape code");
break;
}
s->x = av_clip(s->x, 0, avctx->width - FONT_WIDTH);
s->y = av_clip(s->y, 0, avctx->height - s->font_height);
return 0;
}