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

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Message-ID: <20190221222123.GC6474@magnolia>
Date:   Thu, 21 Feb 2019 14:21:24 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matej Kupljen <matej.kupljen@...il.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: "tmpfs: fix link accounting when a tmpfile is linked in"
Reported-by: dan.carpenter@...cle.com
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.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;