tmpfs: fix uninitialized return value in shmem_link

[ Upstream commit 29b00e609960ae0fcff382f4c7079dd0874a5311 ]

When we made the shmem_reserve_inode call in shmem_link conditional, we
forgot to update the declaration for ret so that it always has a known
value.  Dan Carpenter pointed out this deficiency in the original patch.

Fixes: 1062af920c07 ("tmpfs: fix link accounting when a tmpfile is linked in")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Matej Kupljen <matej.kupljen@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 2147734..9442424 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2896,7 +2896,7 @@ static int shmem_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
 {
        struct inode *inode = d_inode(old_dentry);
-       int ret;
+       int ret = 0;
 
        /*
         * No ordinary (disk based) filesystem counts links as inodes;