[JFFS2][XATTR] Fix memory leak in POSIX-ACL support

jffs2_clear_acl() which releases acl caches allocated by kmalloc()
was defined but it was never called. Thus, we faced to the risk
of memory leaking.

This patch plugs jffs2_clear_acl() into jffs2_do_clear_inode().
It ensures to release acl cache when inode is cleared.
Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/acl.c

@@ -345,10 +345,8 @@ int jffs2_init_acl(struct inode *inode, struct inode *dir)
 	return rc;
 }
 
-void jffs2_clear_acl(struct inode *inode)
+void jffs2_clear_acl(struct jffs2_inode_info *f)
 {
-	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
-
 	if (f->i_acl_access && f->i_acl_access != JFFS2_ACL_NOT_CACHED) {
 		posix_acl_release(f->i_acl_access);
 		f->i_acl_access = JFFS2_ACL_NOT_CACHED;

fs/jffs2/acl.h

@@ -30,7 +30,7 @@ struct jffs2_acl_header {
 extern int jffs2_permission(struct inode *, int, struct nameidata *);
 extern int jffs2_acl_chmod(struct inode *);
 extern int jffs2_init_acl(struct inode *, struct inode *);
-extern void jffs2_clear_acl(struct inode *);
+extern void jffs2_clear_acl(struct jffs2_inode_info *);
 
 extern struct xattr_handler jffs2_acl_access_xattr_handler;
 extern struct xattr_handler jffs2_acl_default_xattr_handler;
@@ -40,6 +40,6 @@ extern struct xattr_handler jffs2_acl_default_xattr_handler;
 #define jffs2_permission NULL
 #define jffs2_acl_chmod(inode)		(0)
 #define jffs2_init_acl(inode,dir)	(0)
-#define jffs2_clear_acl(inode)
+#define jffs2_clear_acl(f)
 
 #endif	/* CONFIG_JFFS2_FS_POSIX_ACL */

fs/jffs2/readinode.c

@@ -968,6 +968,7 @@ void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f)
 	struct jffs2_full_dirent *fd, *fds;
 	int deleted;
 
+	jffs2_clear_acl(f);
 	jffs2_xattr_delete_inode(c, f->inocache);
 	down(&f->sem);
 	deleted = f->inocache && !f->inocache->nlink;