[PATCH] ovl: Avoid some memory allocation

[Christophe JAILLET]

Reorder code to avoid allocating and then freeing some memory in an error
handling path.

Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
---
 fs/overlayfs/namei.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index 023bb0b03352..ba80ebb8a104 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -35,13 +35,13 @@ static int ovl_check_redirect(struct dentry *dentry, struct 
ovl_lookup_data *d,
                        return 0;
                goto fail;
        }
+       if (res == 0)
+               goto invalid;
+
        buf = kzalloc(prelen + res + strlen(post) + 1, GFP_TEMPORARY);
        if (!buf)
                return -ENOMEM;
 
-       if (res == 0)
-               goto invalid;
-
        res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, buf, res);
        if (res < 0)
                goto fail;
-- 
2.9.3