The snow encoder uses block based motion estimation which can read out of array 
if
insufficient alignment is used

Fixes: out of array access
Fixes: 
68963/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SNOW_fuzzer-4979988435632128
Fixes: 
68969/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SNOW_fuzzer-6239933667803136.fuzz

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/utils.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 337c00e789a..7914f799041 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -259,6 +259,9 @@ void avcodec_align_dimensions2(AVCodecContext *s, int 
*width, int *height,
         if (s->codec_id == AV_CODEC_ID_SVQ1) {
             w_align = 64;
             h_align = 64;
+        } else if (s->codec_id == AV_CODEC_ID_SNOW) {
+            w_align = 16;
+            h_align = 16;
         }
         break;
     case AV_PIX_FMT_RGB555:
-- 
2.45.2

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