[CIFS] Do not send newer QFSInfo to legacy servers which can not support it

Fix dialect negotiation to save off when we have negotiated lanman.
This allows us to avoid sending some somewhat newer requests that the server
can not handle and go directly to the older version (infolevel) of the same
call. Make sure we try to negotiate a level which allows us to get the
server OS (which we check so we can detect Win9x vs. other legacy servers
and eventually work around the Win9x DOS time bug (they reverse date/time
fields).

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 6e004587fa48..f2fa05bbcb47 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -46,6 +46,7 @@ static struct {
 } protocols[] = {
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
         {LANMAN_PROT, "\2LM1.2X002"},
+        {LANMAN2_PROT, "\2LANMAN2.1"},
 #endif /* weak password hashing for legacy clients */
         {CIFS_PROT, "\2NT LM 0.12"}, 
         {POSIX_PROT, "\2POSIX 2"},
@@ -67,13 +68,13 @@ static struct {
 /* define the number of elements in the cifs dialect array */
 #ifdef CONFIG_CIFS_POSIX
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
-#define CIFS_NUM_PROT 3
+#define CIFS_NUM_PROT 4
 #else
 #define CIFS_NUM_PROT 2
 #endif /* CIFS_WEAK_PW_HASH */
 #else /* not posix */
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
-#define CIFS_NUM_PROT 2
+#define CIFS_NUM_PROT 3
 #else
 #define CIFS_NUM_PROT 1
 #endif /* CONFIG_CIFS_WEAK_PW_HASH */
@@ -446,7 +447,8 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                 goto neg_err_exit;
 #ifdef CONFIG_CIFS_WEAK_PW_HASH 
         } else if((pSMBr->hdr.WordCount == 13)
-                        && (pSMBr->DialectIndex == LANMAN_PROT)) {
+                        && ((pSMBr->DialectIndex == LANMAN_PROT)
+                                || (pSMBr->DialectIndex == LANMAN2_PROT))) {
                 int tmp, adjust;
                 struct lanman_neg_rsp * rsp = (struct lanman_neg_rsp *)pSMBr;