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Code Issues Releases Activity

avfilter/vf_decimate: fix overreads when using ppsrc

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Derive input parameters from correct inlink when using ppsrc.

Previously both input frames would use dimensions of first inlink,
causing crash if first inlink w/h was smaller than second one.
This commit is contained in:
Paul B Mahol 2020-12-22 13:19:12 +01:00
parent 5dbabb020e
commit 686c07fb1e
1 changed files with 25 additions and 34 deletions
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59
libavfilter/vf_decimate.c
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@ -297,46 +297,12 @@ static int activate(AVFilterContext *ctx)
return 0;
}
static int config_input(AVFilterLink *inlink)
{
int max_value;
AVFilterContext *ctx = inlink->dst;
DecimateContext *dm = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
const int w = inlink->w;
const int h = inlink->h;
dm->hsub = pix_desc->log2_chroma_w;
dm->vsub = pix_desc->log2_chroma_h;
dm->depth = pix_desc->comp[0].depth;
max_value = (1 << dm->depth) - 1;
dm->scthresh = (int64_t)(((int64_t)max_value * w * h * dm->scthresh_flt) / 100);
dm->dupthresh = (int64_t)(((int64_t)max_value * dm->blockx * dm->blocky * dm->dupthresh_flt) / 100);
dm->nxblocks = (w + dm->blockx/2 - 1) / (dm->blockx/2);
dm->nyblocks = (h + dm->blocky/2 - 1) / (dm->blocky/2);
dm->bdiffsize = dm->nxblocks * dm->nyblocks;
dm->bdiffs = av_malloc_array(dm->bdiffsize, sizeof(*dm->bdiffs));
dm->queue = av_calloc(dm->cycle, sizeof(*dm->queue));
if (!dm->bdiffs || !dm->queue)
return AVERROR(ENOMEM);
if (dm->ppsrc) {
dm->clean_src = av_calloc(dm->cycle, sizeof(*dm->clean_src));
if (!dm->clean_src)
return AVERROR(ENOMEM);
}
return 0;
}
static av_cold int decimate_init(AVFilterContext *ctx)
{
DecimateContext *dm = ctx->priv;
AVFilterPad pad = {
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
};
int ret;
@ -404,6 +370,31 @@ static int config_output(AVFilterLink *outlink)
const AVFilterLink *inlink =
ctx->inputs[dm->ppsrc ? INPUT_CLEANSRC : INPUT_MAIN];
AVRational fps = inlink->frame_rate;
int max_value;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
const int w = inlink->w;
const int h = inlink->h;
dm->hsub = pix_desc->log2_chroma_w;
dm->vsub = pix_desc->log2_chroma_h;
dm->depth = pix_desc->comp[0].depth;
max_value = (1 << dm->depth) - 1;
dm->scthresh = (int64_t)(((int64_t)max_value * w * h * dm->scthresh_flt) / 100);
dm->dupthresh = (int64_t)(((int64_t)max_value * dm->blockx * dm->blocky * dm->dupthresh_flt) / 100);
dm->nxblocks = (w + dm->blockx/2 - 1) / (dm->blockx/2);
dm->nyblocks = (h + dm->blocky/2 - 1) / (dm->blocky/2);
dm->bdiffsize = dm->nxblocks * dm->nyblocks;
dm->bdiffs = av_malloc_array(dm->bdiffsize, sizeof(*dm->bdiffs));
dm->queue = av_calloc(dm->cycle, sizeof(*dm->queue));
if (!dm->bdiffs || !dm->queue)
return AVERROR(ENOMEM);
if (dm->ppsrc) {
dm->clean_src = av_calloc(dm->cycle, sizeof(*dm->clean_src));
if (!dm->clean_src)
return AVERROR(ENOMEM);
}
if (!fps.num || !fps.den) {
av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "