linux-kernel - [PATCH] tmpfs: fix uninitialized return value in shmem

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Message-ID: <alpine.LSU.2.11.1902222222570.1594@eggly.anvils>
Date:   Fri, 22 Feb 2019 22:35:32 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matej Kupljen <matej.kupljen@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH] tmpfs: fix uninitialized return value in shmem_link

From: "Darrick J. Wong" <darrick.wong@...cle.com>

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@...cle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Signed-off-by: Hugh Dickins <hughd@...gle.com>
---
 mm/shmem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 0905215fb016..2c012eee133d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2848,7 +2848,7 @@ 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;