four small client fixes

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Merge tag '6.5-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:
 "Four small SMB3 client fixes:

   - two reconnect fixes (to address the case where non-default
     iocharset gets incorrectly overridden at reconnect with the
     default charset)

   - fix for NTLMSSP_AUTH request setting a flag incorrectly)

   - Add missing check for invalid tlink (tree connection) in ioctl"

* tag '6.5-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: add missing return value check for cifs_sb_tlink
  smb3: do not set NTLMSSP_VERSION flag for negotiate not auth request
  cifs: fix charset issue in reconnection
  fs/nls: make load_nls() take a const parameter

fs/nls/nls_base.c

@@ -272,7 +272,7 @@ int unregister_nls(struct nls_table * nls)
 	return -EINVAL;
 }
 
-static struct nls_table *find_nls(char *charset)
+static struct nls_table *find_nls(const char *charset)
 {
 	struct nls_table *nls;
 	spin_lock(&nls_lock);
@@ -288,7 +288,7 @@ static struct nls_table *find_nls(char *charset)
 	return nls;
 }
 
-struct nls_table *load_nls(char *charset)
+struct nls_table *load_nls(const char *charset)
 {
 	return try_then_request_module(find_nls(charset), "nls_%s", charset);
 }

fs/smb/client/cifsglob.h

@@ -1062,6 +1062,7 @@ struct cifs_ses {
 	unsigned long chans_need_reconnect;
 	/* ========= end: protected by chan_lock ======== */
 	struct cifs_ses *dfs_root_ses;
+	struct nls_table *local_nls;
 };
 
 static inline bool

fs/smb/client/cifssmb.c

@@ -129,7 +129,7 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
 	}
 	spin_unlock(&server->srv_lock);
 
-	nls_codepage = load_nls_default();
+	nls_codepage = ses->local_nls;
 
 	/*
 	 * need to prevent multiple threads trying to simultaneously
@@ -200,7 +200,6 @@ cifs_reconnect_tcon(struct cifs_tcon *tcon, int smb_command)
 		rc = -EAGAIN;
 	}
 
-	unload_nls(nls_codepage);
 	return rc;
 }
 

fs/smb/client/connect.c

@@ -1842,6 +1842,10 @@ static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
 			    CIFS_MAX_PASSWORD_LEN))
 			return 0;
 	}
+
+	if (strcmp(ctx->local_nls->charset, ses->local_nls->charset))
+		return 0;
+
 	return 1;
 }
 
@@ -2286,6 +2290,7 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
 
 	ses->sectype = ctx->sectype;
 	ses->sign = ctx->sign;
+	ses->local_nls = load_nls(ctx->local_nls->charset);
 
 	/* add server as first channel */
 	spin_lock(&ses->chan_lock);

fs/smb/client/ioctl.c

@@ -478,6 +478,11 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 			}
 			cifs_sb = CIFS_SB(inode->i_sb);
 			tlink = cifs_sb_tlink(cifs_sb);
+			if (IS_ERR(tlink)) {
+				rc = PTR_ERR(tlink);
+				break;
+			}
+
 			tcon = tlink_tcon(tlink);
 			rc = cifs_dump_full_key(tcon, (void __user *)arg);
 			cifs_put_tlink(tlink);

fs/smb/client/misc.c

@@ -95,6 +95,7 @@ sesInfoFree(struct cifs_ses *buf_to_free)
 		return;
 	}
 
+	unload_nls(buf_to_free->local_nls);
 	atomic_dec(&sesInfoAllocCount);
 	kfree(buf_to_free->serverOS);
 	kfree(buf_to_free->serverDomain);

fs/smb/client/sess.c

@@ -1013,6 +1013,7 @@ int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
 }
 
 
+/* See MS-NLMP 2.2.1.3 */
 int build_ntlmssp_auth_blob(unsigned char **pbuffer,
 					u16 *buflen,
 				   struct cifs_ses *ses,
@@ -1047,7 +1048,8 @@ int build_ntlmssp_auth_blob(unsigned char **pbuffer,
 
 	flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
 		NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
-
+	/* we only send version information in ntlmssp negotiate, so do not set this flag */
+	flags = flags & ~NTLMSSP_NEGOTIATE_VERSION;
 	tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
 	sec_blob->NegotiateFlags = cpu_to_le32(flags);
 

fs/smb/client/smb2pdu.c

@@ -242,7 +242,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 	}
 	spin_unlock(&server->srv_lock);
 
-	nls_codepage = load_nls_default();
+	nls_codepage = ses->local_nls;
 
 	/*
 	 * need to prevent multiple threads trying to simultaneously
@@ -324,7 +324,6 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 		rc = -EAGAIN;
 	}
 failed:
-	unload_nls(nls_codepage);
 	return rc;
 }
 

include/linux/nls.h

@@ -47,7 +47,7 @@ enum utf16_endian {
 /* nls_base.c */
 extern int __register_nls(struct nls_table *, struct module *);
 extern int unregister_nls(struct nls_table *);
-extern struct nls_table *load_nls(char *);
+extern struct nls_table *load_nls(const char *charset);
 extern void unload_nls(struct nls_table *);
 extern struct nls_table *load_nls_default(void);
 #define register_nls(nls) __register_nls((nls), THIS_MODULE)