ext4: add missing error check in __ext4_new_inode()

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@mit.edu>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index b4267d72f24955c314d78f350c4247e6c7373cc2..b32cf263750d1d3b2024847e78bf1c6181e8a44f 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -816,6 +816,8 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
 #ifdef CONFIG_EXT4_FS_POSIX_ACL
                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);