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cifs: fix potential mismatch of UNC paths 

[ Upstream commit 1542552338 ]

Ensure that full_path is an UNC path that contains '\\' as delimiter,
which is required by cifs_build_devname().

The build_path_from_dentry_optional_prefix() function may return a
path with '/' as delimiter when using SMB1 UNIX extensions, for
example.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Paulo Alcantara (SUSE) 2020-02-20 19:49:35 -03:00 committed by Greg Kroah-Hartman
parent a7393e6f2e
commit ddd8b3ed50
1 changed files with 2 additions and 0 deletions
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2
fs/cifs/cifs_dfs_ref.c
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@ -324,6 +324,8 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
if (full_path == NULL)
goto cdda_exit;
convert_delimiter(full_path, '\\');
cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
if (!cifs_sb_master_tlink(cifs_sb)) {