From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Mon, 17 May 2021 20:10:06 +0000 (-0400)
Subject: bcachefs: Fix a memcpy call
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=82355e2882339067e1d6deaec68e629f63259c0d;p=linux.git

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 fcdcf42f85a47..a40459d2b0f06 100644
--- 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;