linux-kernel - [PATCH v2] fs: namespace: suppress 'may be used uninitialized' warnings

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Message-Id: <1409234149-3485-1-git-send-email-tim.gardner@canonical.com>
Date:	Thu, 28 Aug 2014 07:55:49 -0600
From:	rtg.canonical@...il.com
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: [PATCH v2] fs: namespace: suppress 'may be used uninitialized' warnings

From: Tim Gardner <tim.gardner@...onical.com>

The gcc version 4.9.1 compiler complains even though it isn't possible for
these variables to not get initialized before they are used.

fs/namespace.c: In function ‘SyS_mount’:
fs/namespace.c:2720:8: warning: ‘kernel_dev’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  ret = do_mount(kernel_dev, kernel_dir->name, kernel_type, flags,
        ^
fs/namespace.c:2699:8: note: ‘kernel_dev’ was declared here
  char *kernel_dev;
        ^
fs/namespace.c:2720:8: warning: ‘kernel_type’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  ret = do_mount(kernel_dev, kernel_dir->name, kernel_type, flags,
        ^
fs/namespace.c:2697:8: note: ‘kernel_type’ was declared here
  char *kernel_type;
        ^
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---

V1 - use of the uninitialized_var() macro rejected.
V2 - assign automatic variables an initial value.

 fs/namespace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index a01c773..365a06d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2665,9 +2665,9 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
 		char __user *, type, unsigned long, flags, void __user *, data)
 {
 	int ret;
-	char *kernel_type;
+	char *kernel_type = NULL;
 	struct filename *kernel_dir;
-	char *kernel_dev;
+	char *kernel_dev = NULL;
 	unsigned long data_page;
 
 	ret = copy_mount_string(type, &kernel_type);
-- 
2.1.0

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