diff --git a/libavcodec/sunrast.c b/libavcodec/sunrast.c
index 9e49c4f275..cc27838f5b 100644
--- a/libavcodec/sunrast.c
+++ b/libavcodec/sunrast.c
@@ -163,8 +163,10 @@ static int sunrast_decode_frame(AVCodecContext *avctx, AVFrame *p,
         x = 0;
         while (ptr != end && buf < buf_end) {
             run = 1;
-            if (buf_end - buf < 1)
+            if (buf_end - buf < 1) {
+                av_freep(&ptr2);
                 return AVERROR_INVALIDDATA;
+            }
 
             if ((value = *buf++) == RLE_TRIGGER) {
                 run = *buf++ + 1;