bcachefs: Fix a memcpy call

Not supposed to pass a null ptr to memcpy (even if the size is 0).

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

diff --git a/fs/bcachefs/fsck.c b/fs/bcachefs/fsck.c
index fcdcf42..a40459d 100644 (file)
--- a/fs/bcachefs/fsck.c
+++ b/fs/bcachefs/fsck.c
@@ -1161,7 +1161,8 @@ static int add_nlink(struct nlink_table *t, u64 inum, u32 snapshot)
                        return -ENOMEM;
                }
 
-               memcpy(d, t->d, t->size * sizeof(t->d[0]));
+               if (t->d)
+                       memcpy(d, t->d, t->size * sizeof(t->d[0]));
                kvfree(t->d);
 
                t->d = d;