[PATCH 4.14 045/178] ext4: add missing error check in __ext4_new_inode()

From: Greg Kroah-Hartman
Date: Mon Dec 18 2017 - 11:50:26 EST

4.14-stable review patch. If anyone has any objections, please let me know.


From: Theodore Ts'o <tytso@xxxxxxx>

commit 996fc4477a0ea28226b30d175f053fb6f9a4fa36 upstream.

It's possible for ext4_get_acl() to return an ERR_PTR. So we need to
add a check for this case in __ext4_new_inode(). Otherwise on an
error we can end up oops the kernel.

This was getting triggered by xfstests generic/388, which is a test
which exercises the shutdown code path.

Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/ext4/ialloc.c | 2 ++
1 file changed, 2 insertions(+)

--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -816,6 +816,8 @@ struct inode *__ext4_new_inode(handle_t
struct posix_acl *p = get_acl(dir, ACL_TYPE_DEFAULT);

+ if (IS_ERR(p))
+ return ERR_CAST(p);
if (p) {
int acl_size = p->a_count * sizeof(ext4_acl_entry);