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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-10-03 20:15:52 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-10-03 20:28:35 +0200 |
| commit | 6fb9bfb1a356aa4f711e7c45bbf79eaa18e4d522 (patch) | |
| tree | 57cc731a4297f789eb7dad00b3d07f573e0e316b | |
| parent | 693faadd30c569d772cae2c6702895745348c5bd (diff) | |
| download | ffmpeg-6fb9bfb1a356aa4f711e7c45bbf79eaa18e4d522.tar.gz | |
avcodec/gifdec: factorize interleave end handling out
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>
(cherry picked from commit 8f1457864be8fb9653643519dea1c6492f1dde57)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/gifdec.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/libavcodec/gifdec.c b/libavcodec/gifdec.c index 78c8900628..6d9b926b05 100644 --- a/libavcodec/gifdec.c +++ b/libavcodec/gifdec.c @@ -258,26 +258,21 @@ 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; } |