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commit d0d34fca718306df837bbc41dbf87d67c9d99495 Author: Michael Niedermayer <[email protected]> AuthorDate: Tue Mar 3 18:10:28 2026 +0100 Commit: Michael Niedermayer <[email protected]> CommitDate: Tue May 5 18:55:05 2026 +0200 swscale/utils: initialize chroma when luma switched to cascade When luma init switched to cascade the chroma init was skiped Fixes: NULL pointer dereference Fixes: #21583 Found-by: HAORAN FANG Signed-off-by: Michael Niedermayer <[email protected]> (cherry picked from commit dc9bf66796b7c1f4329f127736ddf3258e5ba206) Signed-off-by: Michael Niedermayer <[email protected]> --- libswscale/utils.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/libswscale/utils.c b/libswscale/utils.c index 912747151e..9e9975c1c6 100644 --- a/libswscale/utils.c +++ b/libswscale/utils.c @@ -1730,13 +1730,15 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter, PPC_ALTIVEC(cpu_flags) ? 8 : have_neon(cpu_flags) ? 2 : 1; - if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize, + ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize, c->lumYInc, srcH, dstH, filterAlign, (1 << 12), (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags, cpu_flags, srcFilter->lumV, dstFilter->lumV, c->param, get_local_pos(c, 0, 0, 1), - get_local_pos(c, 0, 0, 1))) < 0) + get_local_pos(c, 0, 0, 1)); + int usecascade = (ret == RETCODE_USE_CASCADE); + if (ret < 0 && !usecascade) goto fail; if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize, c->chrYInc, c->chrSrcH, c->chrDstH, @@ -1748,6 +1750,10 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter, get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0) goto fail; + if (usecascade) { + ret = RETCODE_USE_CASCADE; + goto fail; + } #if HAVE_ALTIVEC c->vYCoeffsBank = av_malloc_array(c->dstH, c->vLumFilterSize * sizeof(*c->vYCoeffsBank)); _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
