4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miklos Szeredi <mszeredi@xxxxxxxxxx>
commit 3f9ca75516a7e581ff803f751a869c1da5ae5fa5 upstream.
New inode operations were forgotten to be added to bad_inode. Most of the
time the op is checked for NULL before being called but marking the inode
bad and the check can race (very unlikely).
However in case of ->get_link() only DCACHE_SYMLINK_TYPE is checked before
calling the op, so there's no race and will definitely oops when trying to
follow links on such a beast.
Also remove comments about extinct ops.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/bad_inode.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 51 insertions(+), 4 deletions(-)
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -106,6 +106,50 @@ static ssize_t bad_inode_listxattr(struc
return -EIO;
}
+static const char *bad_inode_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ return ERR_PTR(-EIO);
+}
+
+static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
+{
+ return ERR_PTR(-EIO);
+}
+
+static int bad_inode_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo, u64 start,
+ u64 len)
+{
+ return -EIO;
+}
+
+static int bad_inode_update_time(struct inode *inode, struct timespec *time,
+ int flags)
+{
+ return -EIO;
+}
+
+static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
+ struct file *file, unsigned int open_flag,
+ umode_t create_mode, int *opened)
+{
+ return -EIO;
+}
+
+static int bad_inode_tmpfile(struct inode *inode, struct dentry *dentry,
+ umode_t mode)
+{
+ return -EIO;
+}
+
+static int bad_inode_set_acl(struct inode *inode, struct posix_acl *acl,
+ int type)
+{
+ return -EIO;
+}
+
static const struct inode_operations bad_inode_ops =
{
.create = bad_inode_create,
@@ -118,14 +162,17 @@ static const struct inode_operations bad
.mknod = bad_inode_mknod,
.rename = bad_inode_rename2,
.readlink = bad_inode_readlink,
- /* follow_link must be no-op, otherwise unmounting this inode
- won't work */
- /* put_link returns void */
- /* truncate returns void */
.permission = bad_inode_permission,
.getattr = bad_inode_getattr,
.setattr = bad_inode_setattr,
.listxattr = bad_inode_listxattr,
+ .get_link = bad_inode_get_link,
+ .get_acl = bad_inode_get_acl,
+ .fiemap = bad_inode_fiemap,
+ .update_time = bad_inode_update_time,
+ .atomic_open = bad_inode_atomic_open,
+ .tmpfile = bad_inode_tmpfile,
+ .set_acl = bad_inode_set_acl,
};
--
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