diff --git a/libavformat/hls.c b/libavformat/hls.c
index 9a4c6304e7..b03201c690 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -454,6 +454,11 @@ static struct segment *new_init_section(struct playlist *pls,
         ptr = strchr(info->byterange, '@');
         if (ptr)
             sec->url_offset = strtoll(ptr+1, NULL, 10);
+        if (sec->size < 0 || sec->url_offset < 0 || sec->size > INT64_MAX - sec->url_offset) {
+            av_freep(&sec->url);
+            av_free(sec);
+            return NULL;
+        }
     } else {
         /* the entire file is the init section */
         sec->size = -1;