linux-kernel - [PATCH] ceph: fix uninitialized return code

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Date:   Mon,  8 Jul 2019 15:48:08 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...nel.org>,
        Luis Henriques <lhenriques@...e.com>,
        ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] ceph: fix uninitialized return code

clang points out a -Wsometimed-uninitized bug in the modified
ceph_real_mount() function:

fs/ceph/super.c:850:6: error: variable 'err' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
        if (!fsc->sb->s_root) {
            ^~~~~~~~~~~~~~~~
fs/ceph/super.c:885:9: note: uninitialized use occurs here
        return err;
               ^~~
fs/ceph/super.c:850:2: note: remove the 'if' if its condition is always true
        if (!fsc->sb->s_root) {
        ^~~~~~~~~~~~~~~~~~~~~~
fs/ceph/super.c:843:9: note: initialize the variable 'err' to silence this warning
        int err;
               ^
                = 0

Set it to zero if the condition is false.

Fixes: 108f95bfaa56 ("vfs: Convert ceph to use the new mount API")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/ceph/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 0d23903ddfa5..d663aa1286f6 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -876,6 +876,8 @@ static int ceph_real_mount(struct fs_context *fc, struct ceph_fs_client *fsc)
 			goto out;
 		}
 		fsc->sb->s_root = root;
+	} else {
+		err = 0;
 	}
 
 	fc->root = dget(fsc->sb->s_root);
-- 
2.20.0