avutil/opt: check for minimum and maximum values when setting AV_OPT_TYPE_DURATION fields

Signed-off-by: Marton Balint <cus@passwd.hu>

libavutil/opt.c

@@ -496,15 +496,22 @@ int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
     case AV_OPT_TYPE_SAMPLE_FMT:
         return set_string_sample_fmt(obj, o, val, dst);
     case AV_OPT_TYPE_DURATION:
-        if (!val) {
-            *(int64_t *)dst = 0;
+        {
+            int64_t usecs = 0;
+            if (val) {
+                if ((ret = av_parse_time(&usecs, val, 1)) < 0) {
+                    av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as duration\n", val);
+                    return ret;
+                }
+            }
+            if (usecs < o->min || usecs > o->max) {
+                av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range [%g - %g]\n",
+                       usecs / 1000000.0, o->name, o->min / 1000000.0, o->max / 1000000.0);
+                return AVERROR(ERANGE);
+            }
+            *(int64_t *)dst = usecs;
             return 0;
-        } else {
-            if ((ret = av_parse_time(dst, val, 1)) < 0)
-                av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as duration\n", val);
-            return ret;
         }
-        break;
     case AV_OPT_TYPE_COLOR:
         return set_string_color(obj, o, val, dst);
     case AV_OPT_TYPE_CHANNEL_LAYOUT: