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avcodec/utvideodec: Set B for the width= 1 case

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Fixes: use of uninitialized meory
Fixes: 428034093/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-6195630160805888

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-08-06 13:09:26 +02:00
committed by michaelni
parent 218a4fe28e
commit 032dfe8584
1 changed files with 1 additions and 1 deletions
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libavcodec/utvideodec.c
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@@ -402,7 +402,7 @@ static void restore_median_planar(UtvideoContext *c, uint8_t *src, ptrdiff_t str
// second line - first element has top prediction, the rest uses median
C = bsrc[-stride];
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 - stride];
bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));