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authorTim Gardner <tim.gardner@canonical.com>2014-08-28 11:26:03 -0600
committerAl Viro <viro@zeniv.linux.org.uk>2014-10-09 02:39:10 -0400
commitb8850d1fa8e2f6653e57daf6d08e58c5f5eb2c85 (patch)
tree5648df7e01da32afbbf962a8c73b54111fd50f5f /fs
parent8ba7f6c2faada3ad553518b9febbdce7a988359b (diff)
fs: namespace: suppress 'may be used uninitialized' warnings
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/compat.c10
-rw-r--r--fs/internal.h2
-rw-r--r--fs/namespace.c26
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 e325b4f9c799..bd4ac19f4d8f 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 00e5b1efa591..abd3abb52616 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2514,21 +2514,9 @@ 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;
}
/*
@@ -2794,8 +2782,9 @@ 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);
@@ -2804,8 +2793,9 @@ 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);