[FFmpeg-cvslog] avcodec/av1dec: Fix resolving zero divisor
Michael Niedermayer
git at videolan.org
Fri Dec 29 14:43:14 EET 2023
ffmpeg | branch: release/6.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Nov 30 02:36:41 2023 +0100| [d93b0009c449ce325eab47eb2958fc4380c9f382] | committer: Michael Niedermayer
avcodec/av1dec: Fix resolving zero divisor
Fixes: Out of array read
Fixes: global-buffer-overflow-AV1
Found-by: "Leonelli, Matteo" <matteo.leonelli at cispa.de>
Tested-by: "Wang, Fei W" <fei.w.wang at intel.com>
Reviewed-by: "Wang, Fei W" <fei.w.wang at intel.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 22daf2148fc072f8f347af939f88b3af7896ab60)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d93b0009c449ce325eab47eb2958fc4380c9f382
---
libavcodec/av1dec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index 6114cb78e6..4dcde234c6 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -177,7 +177,7 @@ static uint8_t get_shear_params_valid(AV1DecContext *s, int idx)
int16_t alpha, beta, gamma, delta, divf, divs;
int64_t v, w;
int32_t *param = &s->cur_frame.gm_params[idx][0];
- if (param[2] < 0)
+ if (param[2] <= 0)
return 0;
alpha = av_clip_int16(param[2] - (1 << AV1_WARPEDMODEL_PREC_BITS));
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