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pictordec: break out of both decoding loops when y drops below 0 

Otherwise picmemset can get called with negative y, resulting in an
invalid write.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2013-08-24 21:30:46 +02:00
parent 8aba7968dd
commit 5f7aecde02
1 changed files with 2 additions and 1 deletions
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3
libavcodec/pictordec.c
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@ -226,7 +226,7 @@ static int decode_frame(AVCodecContext *avctx,
if (bits_per_plane == 8) {
picmemset_8bpp(s, frame, val, run, &x, &y);
if (y < 0)
break;
goto finish;
} else {
picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
}
@ -236,6 +236,7 @@ static int decode_frame(AVCodecContext *avctx,
avpriv_request_sample(s, "Uncompressed image");
return avpkt->size;
}
finish:
*got_frame = 1;
return avpkt->size;