[FFmpeg-cvslog] avcodec/012v: Order operations for odd size handling
Michael Niedermayer
git at videolan.org
Thu Feb 23 23:20:40 EET 2023
ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jan 13 01:01:36 2023 +0100| [2e9faba7c7209dd8d3792ce0f38ee812a2f3828f] | committer: Michael Niedermayer
avcodec/012v: Order operations for odd size handling
Fixes: out of array access
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ZERO12V_fuzzer-6714182078955520.fuzz
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ZERO12V_fuzzer-6698145212137472.fuzz
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 4d42d82563d806b5610c0c91497e24ef7f37d4cf)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2e9faba7c7209dd8d3792ce0f38ee812a2f3828f
---
libavcodec/012v.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/012v.c b/libavcodec/012v.c
index c03afd0bc7..9b7fc173b7 100644
--- a/libavcodec/012v.c
+++ b/libavcodec/012v.c
@@ -131,8 +131,8 @@ static int zero12v_decode_frame(AVCodecContext *avctx, AVFrame *pic,
u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
memcpy(y, y_temp, sizeof(*y) * (width - x));
- memcpy(u, u_temp, sizeof(*u) * (width - x + 1) / 2);
- memcpy(v, v_temp, sizeof(*v) * (width - x + 1) / 2);
+ memcpy(u, u_temp, sizeof(*u) * ((width - x + 1) / 2));
+ memcpy(v, v_temp, sizeof(*v) * ((width - x + 1) / 2));
}
line_end += stride;
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