[FFmpeg-cvslog] avcodec/utils: the IFF_ILBM implementation assumes that there are a multiple of 16 allocated

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sun Apr 16 16:56:40 2023 +0200| [11f241c02ecd538e137919632918b4ece8edfc0f] | committer: Michael Niedermayer

avcodec/utils: the IFF_ILBM implementation assumes that there are a multiple of 16 allocated

Fixes: out of array access
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5124452659888128
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-6362836707442688

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 34056a94eab5f8fbc7e0b8510f7c9851931f23b7)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=11f241c02ecd538e137919632918b4ece8edfc0f
---

 libavcodec/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 12951cbcd5..20ab9a055e 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -323,7 +323,7 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
     }
 
     if (s->codec_id == AV_CODEC_ID_IFF_ILBM) {
-        w_align = FFMAX(w_align, 8);
+        w_align = FFMAX(w_align, 16);
     }
 
     *width  = FFALIGN(*width, w_align);