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From 996fc4477a0ea28226b30d175f053fb6f9a4fa36 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 10 Dec 2017 23:44:11 -0500
Subject: [PATCH] ext4: add missing error check in __ext4_new_inode()
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@mit.edu>
Cc: stable@vger.kernel.org
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index b4267d72f249..b32cf263750d 100644
--- 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);
--
2.15.0
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