From ee5d6d2ef88a3a7fd480435cf931dd6165bbb688 Mon Sep 17 00:00:00 2001
From: Limin Wang <lance.lmwang@gmail.com>
Date: Sun, 29 Mar 2020 09:08:13 +0800
Subject: [PATCH] avfilter/vf_mix: Check sscanf() return value

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
---
 libavfilter/vf_mix.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavfilter/vf_mix.c b/libavfilter/vf_mix.c
index f418c6fba8..bdb67d8e5a 100644
--- a/libavfilter/vf_mix.c
+++ b/libavfilter/vf_mix.c
@@ -108,7 +108,10 @@ static av_cold int init(AVFilterContext *ctx)
             break;
 
         p = NULL;
-        av_sscanf(arg, "%f", &s->weights[i]);
+        if (av_sscanf(arg, "%f", &s->weights[i]) != 1) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid syntax for weights[%d].\n", i);
+            return AVERROR(EINVAL);
+        }
         s->wfactor += s->weights[i];
         last = i;
     }