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cifs: fix issue mounting of DFS ROOT when redirecting from one domain controller to the next

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This patch fixes an issue when cifs_mount receives a
STATUS_BAD_NETWORK_NAME error during cifs_get_tcon but is able to
continue after an DFS ROOT referral. In this case, the return code
variable is not reset prior to trying to mount from the system referred
to. Thus, is_path_accessible is not executed and the final DFS referral
is not performed causing a mount error.

Use case: In DNS, example.com  resolves to the secondary AD server
ad2.example.com Our primary domain controller is ad1.example.com and has
a DFS redirection set up from \\ad1\share\Users to \\files\share\Users.
Mounting \\example.com\share\Users fails.

Regression introduced by commit 724d9f1.

Cc: stable@vger.kernel.org
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru
Signed-off-by: Thomas Hadig <thomas@intapp.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2012-03-21 06:30:40 -04:00 committed by Steve French
parent 10b9b98e41
commit 1daaae8fa4
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/connect.c
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@ -3368,7 +3368,7 @@ cifs_ra_pages(struct cifs_sb_info *cifs_sb)
int
cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
{
int rc = 0;
int rc;
int xid;
struct cifs_ses *pSesInfo;
struct cifs_tcon *tcon;
@ -3395,6 +3395,7 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
FreeXid(xid);
}
#endif
rc = 0;
tcon = NULL;
pSesInfo = NULL;
srvTcp = NULL;