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SubjectRe: [PATCH] hugetlbfs: fix error handling in init_hugetlbfs_fs()
From
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On 10/17/19 3:38 AM, Chengguang Xu wrote:
> In order to avoid using incorrect mnt, we should set
> mnt to NULL when we get error from mount_one_hugetlbfs().
>
> Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>

Thanks for noticing this issue. As mentioned in a previous e-mail,
there are additional issues that need to be addressed. This loop
needs to initialize entries in the hugetlbfs_vfsmount array for all
hstates. How about this patch?

From 3144f0a9d18f1408e831fb3eb49a06636a11d902 Mon Sep 17 00:00:00 2001
From: Mike Kravetz <mike.kravetz@oracle.com>
Date: Mon, 28 Oct 2019 14:08:42 -0700
Subject: [PATCH] mm/hugetlbfs: fix error handling when setting up mounts

It is assumed that the hugetlbfs_vfsmount[] array will contain
either a valid vfsmount pointer or NULL for each hstate after
initialization. Changes made while converting to use fs_context
broke this assumption.

Reported-by: Chengguang Xu <cgxu519@mykernel.net>
Fixes: 32021982a324 ("hugetlbfs: Convert to fs_context")
Cc: stable@vger.kernel.org
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
---
fs/hugetlbfs/inode.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index a478df035651..178389209561 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1470,15 +1470,17 @@ static int __init init_hugetlbfs_fs(void)
i = 0;
for_each_hstate(h) {
mnt = mount_one_hugetlbfs(h);
- if (IS_ERR(mnt) && i == 0) {
+ if (IS_ERR(mnt)) {
+ hugetlbfs_vfsmount[i] = NULL;
error = PTR_ERR(mnt);
- goto out;
+ } else {
+ hugetlbfs_vfsmount[i] = mnt;
}
- hugetlbfs_vfsmount[i] = mnt;
i++;
}

- return 0;
+ if (hugetlbfs_vfsmount[default_hstate_idx] != NULL)
+ return 0;

out:
kmem_cache_destroy(hugetlbfs_inode_cachep);
--
2.20.1
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