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avcodec/gifdec: factorize interleave end handling out

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also change it to a loop
Fixes out of array access
Fixes: asan_heap-oob_ca5410_8_asan_heap-oob_ca5410_97_ID_LSD_Size_Less_Then_Data_Inter_3.gif

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-03 20:15:52 +02:00
parent e7e5114c50
commit 8f1457864b
1 changed files with 5 additions and 10 deletions
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15
libavcodec/gifdec.c
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@ -271,26 +271,21 @@ static int gif_read_image(GifState *s, AVFrame *frame)
case 1:
y1 += 8;
ptr += linesize * 8;
if (y1 >= height) {
y1 = pass ? 2 : 4;
ptr = ptr1 + linesize * y1;
pass++;
}
break;
case 2:
y1 += 4;
ptr += linesize * 4;
if (y1 >= height) {
y1 = 1;
ptr = ptr1 + linesize;
pass++;
}
break;
case 3:
y1 += 2;
ptr += linesize * 2;
break;
}
while (y1 >= height) {
y1 = 4 >> pass;
ptr = ptr1 + linesize * y1;
pass++;
}
} else {
ptr += linesize;
}