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cifs: fix DFS mount with cifsacl/modefromsid

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[ Upstream commit 01ec372cef1e5afa4ab843bbaf88a6fcb64dc14c ]

RHBZ: 1871246

If during cifs_lookup()/get_inode_info() we encounter a DFS link
and we use the cifsacl or modefromsid mount options we must suppress
any -EREMOTE errors that triggers or else we will not be able to follow
the DFS link and automount the target.

This fixes an issue with modefromsid/cifsacl where these mountoptions
would break DFS and we would no longer be able to access the share.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ronnie Sahlberg 2020-09-03 10:02:39 +10:00 • committed by Greg Kroah-Hartman
commit 5dda8b9b6a
1 changed files with 4 additions and 0 deletions
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4
fs/cifs/inode.c
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@ -898,6 +898,8 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
full_path, fid);
if (rc == -EREMOTE)
rc = 0;
if (rc) {
cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
__func__, rc);
@ -906,6 +908,8 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
full_path, fid);
if (rc == -EREMOTE)
rc = 0;
if (rc) {
cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
__func__, rc);