vf_psnr/ssim: don't crash if stats_file is NULL.

1 files changed, 13 insertions, 11 deletions

diff --git a/libavfilter/vf_ssim.c b/libavfilter/vf_ssim.c
index 4dc96a73fb..ce1e3db98e 100644
--- a/libavfilter/vf_ssim.c
+++ b/libavfilter/vf_ssim.c
@@ -223,17 +223,19 @@ static av_cold int init(AVFilterContext *ctx)
 {
     SSIMContext *s = ctx->priv;
 
-    if (!strcmp(s->stats_file_str, "-")) {
-        s->stats_file = stdout;
-    } else if (s->stats_file_str) {
-        s->stats_file = fopen(s->stats_file_str, "w");
-        if (!s->stats_file) {
-            int err = AVERROR(errno);
-            char buf[128];
-            av_strerror(err, buf, sizeof(buf));
-            av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
-                   s->stats_file_str, buf);
-            return err;
+    if (s->stats_file_str) {
+        if (!strcmp(s->stats_file_str, "-")) {
+            s->stats_file = stdout;
+        } else {
+            s->stats_file = fopen(s->stats_file_str, "w");
+            if (!s->stats_file) {
+                int err = AVERROR(errno);
+                char buf[128];
+                av_strerror(err, buf, sizeof(buf));
+                av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
+                       s->stats_file_str, buf);
+                return err;
+            }
         }
     }