diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index fe30aabe00d78d5d432a62dc62cca4c3337f7b5c..c608ea62f53618119247ee372094929eb776c0dd 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -58,6 +58,7 @@ bool traceSMB;
 bool enable_oplocks = true;
 bool linuxExtEnabled = true;
 bool lookupCacheEnabled = true;
+bool disable_legacy_dialects; /* false by default */
 unsigned int global_secflags = CIFSSEC_DEF;
 /* unsigned int ntlmv2_support = 0; */
 unsigned int sign_CIFS_PDUs = 1;
@@ -83,6 +84,15 @@ MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
 module_param(enable_oplocks, bool, 0644);
 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
 
+module_param(disable_legacy_dialects, bool, 0644);
+MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
+				  "helpful to restrict the ability to "
+				  "override the default dialects (SMB2.1, "
+				  "SMB3 and SMB3.02) on mount with old "
+				  "dialects (CIFS/SMB1 and SMB2) since "
+				  "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
+				  " and less secure. Default: n/N/0");
+
 extern mempool_t *cifs_sm_req_poolp;
 extern mempool_t *cifs_req_poolp;
 extern mempool_t *cifs_mid_poolp;
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d8c8700454edb7072d22521a194facc108ac6ed6..d2ac9ced28c909418f6efc0d497b0804d9dae864 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1700,16 +1700,17 @@ GLOBAL_EXTERN atomic_t smBufAllocCount;
 GLOBAL_EXTERN atomic_t midCount;
 
 /* Misc globals */
-GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
-GLOBAL_EXTERN bool lookupCacheEnabled;
-GLOBAL_EXTERN unsigned int global_secflags;	/* if on, session setup sent
+extern bool enable_oplocks; /* enable or disable oplocks */
+extern bool lookupCacheEnabled;
+extern unsigned int global_secflags;	/* if on, session setup sent
 				with more secure ntlmssp2 challenge/resp */
-GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
-GLOBAL_EXTERN bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
-GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
-GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
-GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
-GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
+extern unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
+extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
+extern unsigned int CIFSMaxBufSize;  /* max size not including hdr */
+extern unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
+extern unsigned int cifs_min_small;  /* min size of small buf pool */
+extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
+extern bool disable_legacy_dialects;  /* forbid vers=1.0 and vers=2.0 mounts */
 
 #ifdef CONFIG_CIFS_ACL
 GLOBAL_EXTERN struct rb_root uidtree;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 83b0234d443c675c5d169b4a9c825bb45021d2cc..ed3b6de88395ddae89f35f84a7c16248251a1930 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -61,6 +61,7 @@
 #define RFC1001_PORT 139
 
 extern mempool_t *cifs_req_poolp;
+extern bool disable_legacy_dialects;
 
 /* FIXME: should these be tunable? */
 #define TLINK_ERROR_EXPIRE	(1 * HZ)
@@ -1146,10 +1147,18 @@ cifs_parse_smb_version(char *value, struct smb_vol *vol)
 
 	switch (match_token(value, cifs_smb_version_tokens, args)) {
 	case Smb_1:
+		if (disable_legacy_dialects) {
+			cifs_dbg(VFS, "mount with legacy dialect disabled\n");
+			return 1;
+		}
 		vol->ops = &smb1_operations;
 		vol->vals = &smb1_values;
 		break;
 	case Smb_20:
+		if (disable_legacy_dialects) {
+			cifs_dbg(VFS, "mount with legacy dialect disabled\n");
+			return 1;
+		}
 		vol->ops = &smb20_operations;
 		vol->vals = &smb20_values;
 		break;