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| author | Tim Gardner <tim.gardner@canonical.com> | 2014-08-28 11:26:03 -0600 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-04-04 22:21:52 +0100 |
| commit | 0ffcf69c1afee1cbe7c34f473e04e8526638295f (patch) | |
| tree | 18d74fd6db1051d646feaafa0ddacbae2095cd7e /fs | |
| parent | 65be6fa1da9eb665ae50b2d52bc450e64cbc4ec0 (diff) | |
| download | linux-stable-0ffcf69c1afee1cbe7c34f473e04e8526638295f.tar.gz linux-stable-0ffcf69c1afee1cbe7c34f473e04e8526638295f.tar.bz2 linux-stable-0ffcf69c1afee1cbe7c34f473e04e8526638295f.zip | |
fs: namespace: suppress 'may be used uninitialized' warnings
commit b8850d1fa8e2f6653e57daf6d08e58c5f5eb2c85 upstream.
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;
^
Fix the warnings by simplifying copy_mount_string() as suggested by Al Viro.
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/compat.c | 10 | ||||
| -rw-r--r-- | fs/internal.h | 2 | ||||
| -rw-r--r-- | fs/namespace.c | 26 |
3 files changed, 15 insertions, 23 deletions
diff --git a/fs/compat.c b/fs/compat.c index 66d3d3c6b4b2..6205c247a6e3 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -797,8 +797,9 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, struct filename *dir; int retval; - retval = copy_mount_string(type, &kernel_type); - if (retval < 0) + kernel_type = copy_mount_string(type); + retval = PTR_ERR(kernel_type); + if (IS_ERR(kernel_type)) goto out; dir = getname(dir_name); @@ -806,8 +807,9 @@ COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name, if (IS_ERR(dir)) goto out1; - retval = copy_mount_string(dev_name, &kernel_dev); - if (retval < 0) + kernel_dev = copy_mount_string(dev_name); + retval = PTR_ERR(kernel_dev); + if (IS_ERR(kernel_dev)) goto out2; retval = copy_mount_options(data, &data_page); diff --git a/fs/internal.h b/fs/internal.h index 465742407466..3ce29c92cc44 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -51,7 +51,7 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *, * namespace.c */ extern int copy_mount_options(const void __user *, unsigned long *); -extern int copy_mount_string(const void __user *, char **); +extern char *copy_mount_string(const void __user *); extern struct vfsmount *lookup_mnt(struct path *); extern int finish_automount(struct vfsmount *, struct path *); diff --git a/fs/namespace.c b/fs/namespace.c index c2eb7ec1bb08..c1c0c8179498 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -2482,21 +2482,9 @@ int copy_mount_options(const void __user * data, unsigned long *where) return 0; } -int copy_mount_string(const void __user *data, char **where) +char *copy_mount_string(const void __user *data) { - char *tmp; - - if (!data) { - *where = NULL; - return 0; - } - - tmp = strndup_user(data, PAGE_SIZE); - if (IS_ERR(tmp)) - return PTR_ERR(tmp); - - *where = tmp; - return 0; + return data ? strndup_user(data, PAGE_SIZE) : NULL; } /* @@ -2766,8 +2754,9 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name, char *kernel_dev; unsigned long data_page; - ret = copy_mount_string(type, &kernel_type); - if (ret < 0) + kernel_type = copy_mount_string(type); + ret = PTR_ERR(kernel_type); + if (IS_ERR(kernel_type)) goto out_type; kernel_dir = getname(dir_name); @@ -2776,8 +2765,9 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name, goto out_dir; } - ret = copy_mount_string(dev_name, &kernel_dev); - if (ret < 0) + kernel_dev = copy_mount_string(dev_name); + ret = PTR_ERR(kernel_dev); + if (IS_ERR(kernel_dev)) goto out_dev; ret = copy_mount_options(data, &data_page); |