This is a note to let you know that I've just added the patch titled
mm/hugetlbfs: fix error handling when setting up mounts
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-hugetlbfs-fix-error-handling-when-setting-up-moun.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9e8eb6d74a7aa67fd06ad407af15ef494e11f2a6
Author: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Date: Sat Nov 30 17:56:34 2019 -0800
mm/hugetlbfs: fix error handling when setting up mounts
[ Upstream commit 8fc312b32b25c6b0a8b46fab4df8c68df5af1223 ]
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.
While fixing the hugetlbfs_vfsmount issue, it was discovered that
init_hugetlbfs_fs never did correctly clean up when encountering a vfs
mount error.
It was found during code inspection. A small memory allocation failure
would be the most likely cause of taking a error path with the bug.
This is unlikely to happen as this is early init code.
Link: http://lkml.kernel.org/r/94b6244d-2c24-e269-b12c-e3ba694b242d@xxxxxxxxxx
Reported-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
Fixes: 32021982a324 ("hugetlbfs: Convert to fs_context")
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index a478df035651..26e3906c18fe 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1461,28 +1461,41 @@ static int __init init_hugetlbfs_fs(void)
sizeof(struct hugetlbfs_inode_info),
0, SLAB_ACCOUNT, init_once);
if (hugetlbfs_inode_cachep == NULL)
- goto out2;
+ goto out;
error = register_filesystem(&hugetlbfs_fs_type);
if (error)
- goto out;
+ goto out_free;
+ /* default hstate mount is required */
+ mnt = mount_one_hugetlbfs(&hstates[default_hstate_idx]);
+ if (IS_ERR(mnt)) {
+ error = PTR_ERR(mnt);
+ goto out_unreg;
+ }
+ hugetlbfs_vfsmount[default_hstate_idx] = mnt;
+
+ /* other hstates are optional */
i = 0;
for_each_hstate(h) {
+ if (i == default_hstate_idx)
+ continue;
+
mnt = mount_one_hugetlbfs(h);
- if (IS_ERR(mnt) && i == 0) {
- error = PTR_ERR(mnt);
- goto out;
- }
- hugetlbfs_vfsmount[i] = mnt;
+ if (IS_ERR(mnt))
+ hugetlbfs_vfsmount[i] = NULL;
+ else
+ hugetlbfs_vfsmount[i] = mnt;
i++;
}
return 0;
- out:
+ out_unreg:
+ (void)unregister_filesystem(&hugetlbfs_fs_type);
+ out_free:
kmem_cache_destroy(hugetlbfs_inode_cachep);
- out2:
+ out:
return error;
}
fs_initcall(init_hugetlbfs_fs)
