From: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/compat.c | 10 ++++++----
fs/internal.h | 2 +-
fs/namespace.c | 26 ++++++++------------------
3 files changed, 15 insertions(+), 23 deletions(-)
diff --git a/fs/compat.c b/fs/compat.c
index 6af20de2c1a3..e1258be2848f 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -781,8 +781,9 @@ asmlinkage long compat_sys_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);
@@ -790,8 +791,9 @@ asmlinkage long compat_sys_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 513e0d859a6c..6026fc0fbae0 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -53,7 +53,7 @@ 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 185cd1aefa14..9ae6837ef5bf 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2323,21 +2323,9 @@ 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;
}
/*
@@ -2617,8 +2605,9 @@ 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);
@@ -2627,8 +2616,9 @@ 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);
--
2.4.3
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