Sysfs: fix possible memleak in sysfs_follow_link

There is the possiblity of a memory leak if a page is allocated and if
sysfs_getlink() fails in the sysfs_follow_link.

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index a3ba217..1d897ad 100644 (file)
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -192,8 +192,11 @@ static void *sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
        int error = -ENOMEM;
        unsigned long page = get_zeroed_page(GFP_KERNEL);
-       if (page)
+       if (page) {
                error = sysfs_getlink(dentry, (char *) page); 
+               if (error < 0)
+                       free_page((unsigned long)page);
+       }
        nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
        return NULL;
 }