avfilter/vf_deflicker: fix invalid access

Fixes #8253

avfilter/vf_deflicker: fix invalid access
Fixes #8253
b62f7e24 · Paul B Mahol · 7ad69a73 · b62f7e24
Commit b62f7e24 authored Oct 11, 2019 by Paul B Mahol
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vf_deflicker.c libavfilter/vf_deflicker.c +4 -1

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--- a/libavfilter/vf_deflicker.c
+++ b/libavfilter/vf_deflicker.c
@@ -420,7 +420,10 @@ static int request_frame(AVFilterLink *outlink)

    ret = ff_request_frame(ctx->inputs[0]);
    if (ret == AVERROR_EOF && s->available > 0) {
-        AVFrame *buf = av_frame_clone(ff_bufqueue_peek(&s->q, s->size - 1));
+        AVFrame *buf = ff_bufqueue_peek(&s->q, s->available - 1);
+        if (!buf)
+            return AVERROR(ENOMEM);
+        buf = av_frame_clone(buf);
        if (!buf)
            return AVERROR(ENOMEM);