getname_kernel() needs to make sure that ->name != ->iname in long case

missed it in "kill struct filename.separate" several years ago.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 6e0f6eea9896..3aefcf74f041 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -222,9 +222,10 @@ getname_kernel(const char * filename)
         if (len <= EMBEDDED_NAME_MAX) {
                 result->name = (char *)result->iname;
         } else if (len <= PATH_MAX) {
+                const size_t size = offsetof(struct filename, iname[1]);
                 struct filename *tmp;
 
-                tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+                tmp = kmalloc(size, GFP_KERNEL);
                 if (unlikely(!tmp)) {
                         __putname(result);
                         return ERR_PTR(-ENOMEM);