[FFmpeg-devel] [PATCH 1/7] avcodec/utils: apply the same alignment to YUV410 as we do to YUV420 when motion estimation is used

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/7] avcodec/utils: apply the same alignment to YUV410 as we do to YUV420 when motion estimation is used
Date: Tue, 18 Jun 2024 15:48:20 +0200
Message-ID: <20240618134826.2189719-1-michael@niedermayer.cc> (raw)

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 <michael@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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