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avfilter/vf_overlay: fix crash with negative y

This commit is contained in:
Paul B Mahol 2018-11-20 23:18:47 +01:00
parent e3a9630982
commit 57815cfad5
1 changed files with 4 additions and 4 deletions
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8
libavfilter/vf_overlay.c
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@ -473,12 +473,12 @@ static av_always_inline void blend_plane(AVFilterContext *ctx,
slice_start = (jmax * jobnr) / nb_jobs;
slice_end = (jmax * (jobnr+1)) / nb_jobs;
sp = src->data[i] + slice_start * src->linesize[i];
sp = src->data[i] + (j + slice_start) * src->linesize[i];
dp = dst->data[dst_plane]
+ (yp + slice_start) * dst->linesize[dst_plane]
+ (yp + j + slice_start) * dst->linesize[dst_plane]
+ dst_offset;
ap = src->data[3] + (slice_start << vsub) * src->linesize[3];
dap = dst->data[3] + ((yp + slice_start) << vsub) * dst->linesize[3];
ap = src->data[3] + (j + slice_start << vsub) * src->linesize[3];
dap = dst->data[3] + ((yp + j + slice_start) << vsub) * dst->linesize[3];
for (j = j + slice_start; j < slice_end; j++) {
k = FFMAX(-xp, 0);