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avcodec/utvideodec: Set B for the width= 1 case in restore_median_planar_il()

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Fixes: use of uninitialized memory
Fixes: 439878388/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-5635866203848704

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 59db32b433)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-11-08 23:22:56 +01:00
parent 3491fc6b8d
commit 4f88deb6cb
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1 changed files with 1 additions and 1 deletions
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libavcodec/utvideodec.c
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@ -436,7 +436,7 @@ static void restore_median_planar_il(UtvideoContext *c, uint8_t *src, ptrdiff_t
// second line - first element has top prediction, the rest uses median
C = bsrc[-stride2];
bsrc[0] += C;
A = bsrc[0];
A = B = bsrc[0];
for (i = 1; i < FFMIN(width, 16); i++) { /* scalar loop (DSP need align 16) */
B = bsrc[i - stride2];
bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));