1 files changed, 4 insertions, 0 deletions

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 26ebafa8c41d..2c9242e3fed0 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -469,6 +469,10 @@ int bitmap_scnlistprintf(char *buf, unsigned int buflen,
         /* current bit is 'cur', most recently seen range is [rbot, rtop] */
         int cur, rbot, rtop;
 
+        if (buflen == 0)
+                return 0;
+        buf[0] = 0;
+
         rbot = cur = find_first_bit(maskp, nmaskbits);
         while (cur < nmaskbits) {
                 rtop = cur;