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Sysfs: fix possible memleak in sysfs_follow_link

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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>
This commit is contained in:
Armin Kuster 2009-04-29 07:29:59 -10:00 committed by Greg Kroah-Hartman
parent b22813b373
commit 557411eb2c
1 changed files with 4 additions and 1 deletions
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5
fs/sysfs/symlink.c
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@ -192,8 +192,11 @@ static void *sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{ {
int error = -ENOMEM; int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL); unsigned long page = get_zeroed_page(GFP_KERNEL);
if (page) if (page) {
error = sysfs_getlink(dentry, (char *) 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); nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
return NULL; return NULL;
} }