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lavfi/deshake: Check alignment before calling asm init function.

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Do this for every frame to make sure dynamic filters do not
cause crashes.

Fixes ticket #7078.
This commit is contained in:
Carl Eugen Hoyos 2018-03-16 19:54:03 +01:00
parent 1c49365c62
commit cbbefc05b1
1 changed files with 6 additions and 4 deletions
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10
libavfilter/vf_deshake.c
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@ -342,10 +342,6 @@ static av_cold int init(AVFilterContext *ctx)
{
DeshakeContext *deshake = ctx->priv;
deshake->sad = av_pixelutils_get_sad_fn(4, 4, 1, deshake); // 16x16, 2nd source unaligned
if (!deshake->sad)
return AVERROR(EINVAL);
deshake->refcount = 20; // XXX: add to options?
deshake->blocksize /= 2;
deshake->blocksize = av_clip(deshake->blocksize, 4, 128);
@ -424,6 +420,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
const int chroma_width = AV_CEIL_RSHIFT(link->w, desc->log2_chroma_w);
const int chroma_height = AV_CEIL_RSHIFT(link->h, desc->log2_chroma_h);
int aligned;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
@ -432,6 +429,11 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
}
av_frame_copy_props(out, in);
aligned = !((intptr_t)in->data[0] & 15 | in->linesize[0] & 15);
deshake->sad = av_pixelutils_get_sad_fn(4, 4, aligned, deshake); // 16x16, 2nd source unaligned
if (!deshake->sad)
return AVERROR(EINVAL);
if (deshake->cx < 0 || deshake->cy < 0 || deshake->cw < 0 || deshake->ch < 0) {
// Find the most likely global motion for the current frame
find_motion(deshake, (deshake->ref == NULL) ? in->data[0] : deshake->ref->data[0], in->data[0], link->w, link->h, in->linesize[0], &t);