[PATCH 5.7 160/179] vfs/xattr: mm/shmem: kernfs: release simple xattr entry in a right way

[Greg Kroah-Hartman]

From: Chengguang Xu <cgxu...@mykernel.net>

commit 3bef735ad7b7d987069181e7b58588043cbd1509 upstream.

After commit fdc85222d58e ("kernfs: kvmalloc xattr value instead of
kmalloc"), simple xattr entry is allocated with kvmalloc() instead of
kmalloc(), so we should release it with kvfree() instead of kfree().

Fixes: fdc85222d58e ("kernfs: kvmalloc xattr value instead of kmalloc")
Signed-off-by: Chengguang Xu <cgxu...@mykernel.net>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Acked-by: Hugh Dickins <hu...@google.com>
Acked-by: Tejun Heo <t...@kernel.org>
Cc: Daniel Xu <d...@dxuuu.xyz>
Cc: Chris Down <ch...@chrisdown.name>
Cc: Andreas Dilger <adil...@dilger.ca>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Cc: <sta...@vger.kernel.org>    [5.7]
Link: http://lkml.kernel.org/r/20200704051608.15043-1-cgxu...@mykernel.net
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 include/linux/xattr.h |    3 ++-
 mm/shmem.c            |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/spinlock.h>
+#include <linux/mm.h>
 #include <uapi/linux/xattr.h>
 
 struct inode;
@@ -94,7 +95,7 @@ static inline void simple_xattrs_free(st
 
        list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
                kfree(xattr->name);
-               kfree(xattr);
+               kvfree(xattr);
        }
 }
 
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3205,7 +3205,7 @@ static int shmem_initxattrs(struct inode
                new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len,
                                          GFP_KERNEL);
                if (!new_xattr->name) {
-                       kfree(new_xattr);
+                       kvfree(new_xattr);
                        return -ENOMEM;
                }