Fix find_next_zero_bit when no bit is available

* ext2fs/bitmap.c (find_next_zero_bit): Check whether TMP has a bit set before
calling ffz.

1 files changed, 2 insertions, 0 deletions

diff --git a/ext2fs/bitmap.c b/ext2fs/bitmap.c
index e512d011..92850232 100644
--- a/ext2fs/bitmap.c
+++ b/ext2fs/bitmap.c
@@ -91,6 +91,8 @@ find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
 
 found_first:
   tmp |= ~0UL << size;
+  if (!~tmp)
+    return result + size;
 found_middle:
   return result + ffz(tmp);
 }