cifs: don't declare smb_vol info on the stack

struct smb_vol is fairly large, it's probably best to kzalloc it...
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/connect.c

@@ -2185,27 +2185,30 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 {
 	int rc = 0;
 	int xid;
-	struct smb_vol volume_info;
+	struct smb_vol *volume_info;
 	struct cifsSesInfo *pSesInfo = NULL;
 	struct cifsTconInfo *tcon = NULL;
 	struct TCP_Server_Info *srvTcp = NULL;
 
 	xid = GetXid();
 
-/* cFYI(1, ("Entering cifs_mount. Xid: %d with: %s", xid, mount_data)); */
+	volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
+	if (!volume_info) {
+		rc = -ENOMEM;
+		goto out;
+	}
 
-	memset(&volume_info, 0, sizeof(struct smb_vol));
-	if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
+	if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
 		rc = -EINVAL;
 		goto out;
 	}
 
-	if (volume_info.nullauth) {
+	if (volume_info->nullauth) {
 		cFYI(1, ("null user"));
-		volume_info.username = "";
-	} else if (volume_info.username) {
+		volume_info->username = "";
+	} else if (volume_info->username) {
 		/* BB fixme parse for domain name here */
-		cFYI(1, ("Username: %s", volume_info.username));
+		cFYI(1, ("Username: %s", volume_info->username));
 	} else {
 		cifserror("No username specified");
 	/* In userspace mount helper we can get user name from alternate
@@ -2216,27 +2219,27 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 
 	/* this is needed for ASCII cp to Unicode converts */
-	if (volume_info.iocharset == NULL) {
+	if (volume_info->iocharset == NULL) {
 		cifs_sb->local_nls = load_nls_default();
 	/* load_nls_default can not return null */
 	} else {
-		cifs_sb->local_nls = load_nls(volume_info.iocharset);
+		cifs_sb->local_nls = load_nls(volume_info->iocharset);
 		if (cifs_sb->local_nls == NULL) {
 			cERROR(1, ("CIFS mount error: iocharset %s not found",
-				 volume_info.iocharset));
+				 volume_info->iocharset));
 			rc = -ELIBACC;
 			goto out;
 		}
 	}
 
 	/* get a reference to a tcp session */
-	srvTcp = cifs_get_tcp_session(&volume_info);
+	srvTcp = cifs_get_tcp_session(volume_info);
 	if (IS_ERR(srvTcp)) {
 		rc = PTR_ERR(srvTcp);
 		goto out;
 	}
 
-	pSesInfo = cifs_find_smb_ses(srvTcp, volume_info.username);
+	pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
 	if (pSesInfo) {
 		cFYI(1, ("Existing smb sess found (status=%d)",
 			pSesInfo->status));
@@ -2274,24 +2277,24 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
 		write_unlock(&cifs_tcp_ses_lock);
 
-		/* volume_info.password freed at unmount */
-		if (volume_info.password) {
-			pSesInfo->password = volume_info.password;
+		/* volume_info->password freed at unmount */
+		if (volume_info->password) {
+			pSesInfo->password = volume_info->password;
 			/* set to NULL to prevent freeing on exit */
-			volume_info.password = NULL;
+			volume_info->password = NULL;
 		}
-		if (volume_info.username)
-			strncpy(pSesInfo->userName, volume_info.username,
+		if (volume_info->username)
+			strncpy(pSesInfo->userName, volume_info->username,
 				MAX_USERNAME_SIZE);
-		if (volume_info.domainname) {
-			int len = strlen(volume_info.domainname);
+		if (volume_info->domainname) {
+			int len = strlen(volume_info->domainname);
 			pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
 			if (pSesInfo->domainName)
 				strcpy(pSesInfo->domainName,
-					volume_info.domainname);
+					volume_info->domainname);
 		}
-		pSesInfo->linux_uid = volume_info.linux_uid;
-		pSesInfo->overrideSecFlg = volume_info.secFlg;
+		pSesInfo->linux_uid = volume_info->linux_uid;
+		pSesInfo->overrideSecFlg = volume_info->secFlg;
 		down(&pSesInfo->sesSem);
 
 		/* BB FIXME need to pass vol->secFlgs BB */
@@ -2302,14 +2305,14 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 	/* search for existing tcon to this server share */
 	if (!rc) {
-		setup_cifs_sb(&volume_info, cifs_sb);
+		setup_cifs_sb(volume_info, cifs_sb);
 
-		tcon = cifs_find_tcon(pSesInfo, volume_info.UNC);
+		tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
 		if (tcon) {
 			cFYI(1, ("Found match on UNC path"));
 			/* existing tcon already has a reference */
 			cifs_put_smb_ses(pSesInfo);
-			if (tcon->seal != volume_info.seal)
+			if (tcon->seal != volume_info->seal)
 				cERROR(1, ("transport encryption setting "
 					   "conflicts with existing tid"));
 		} else {
@@ -2321,8 +2324,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			tcon->ses = pSesInfo;
 
 			/* check for null share name ie connect to dfs root */
-			if ((strchr(volume_info.UNC + 3, '\\') == NULL)
-			    && (strchr(volume_info.UNC + 3, '/') == NULL)) {
+			if ((strchr(volume_info->UNC + 3, '\\') == NULL)
+			    && (strchr(volume_info->UNC + 3, '/') == NULL)) {
 				/* rc = connect_to_dfs_path(...) */
 				cFYI(1, ("DFS root not supported"));
 				rc = -ENODEV;
@@ -2331,10 +2334,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 				/* BB Do we need to wrap sesSem around
 				 * this TCon call and Unix SetFS as
 				 * we do on SessSetup and reconnect? */
-				rc = CIFSTCon(xid, pSesInfo, volume_info.UNC,
+				rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
 					      tcon, cifs_sb->local_nls);
 				cFYI(1, ("CIFS Tcon rc = %d", rc));
-				if (volume_info.nodfs) {
+				if (volume_info->nodfs) {
 					tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
 					cFYI(1, ("DFS disabled (%d)",
 						tcon->Flags));
@@ -2342,7 +2345,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			}
 			if (rc)
 				goto mount_fail_check;
-			tcon->seal = volume_info.seal;
+			tcon->seal = volume_info->seal;
 			write_lock(&cifs_tcp_ses_lock);
 			list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
 			write_unlock(&cifs_tcp_ses_lock);
@@ -2352,9 +2355,9 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		   to a share so for resources mounted more than once
 		   to the same server share the last value passed in
 		   for the retry flag is used */
-		tcon->retry = volume_info.retry;
-		tcon->nocase = volume_info.nocase;
-		tcon->local_lease = volume_info.local_lease;
+		tcon->retry = volume_info->retry;
+		tcon->nocase = volume_info->nocase;
+		tcon->local_lease = volume_info->local_lease;
 	}
 	if (pSesInfo) {
 		if (pSesInfo->capabilities & CAP_LARGE_FILES) {
@@ -2391,7 +2394,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	if (tcon->ses->capabilities & CAP_UNIX)
 		/* reset of caps checks mount to see if unix extensions
 		   disabled for just this mount */
-		reset_cifs_unix_caps(xid, tcon, sb, &volume_info);
+		reset_cifs_unix_caps(xid, tcon, sb, volume_info);
 	else
 		tcon->unix_ext = 0; /* server does not support them */
 
@@ -2410,18 +2413,22 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		cifs_sb->rsize = min(cifs_sb->rsize,
 			       (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
 
-	/* volume_info.password is freed above when existing session found
+	/* volume_info->password is freed above when existing session found
 	(in which case it is not needed anymore) but when new sesion is created
 	the password ptr is put in the new session structure (in which case the
 	password will be freed at unmount time) */
 out:
 	/* zero out password before freeing */
-	if (volume_info.password != NULL) {
-		memset(volume_info.password, 0, strlen(volume_info.password));
-		kfree(volume_info.password);
+	if (volume_info) {
+		if (volume_info->password != NULL) {
+			memset(volume_info->password, 0,
+				strlen(volume_info->password));
+			kfree(volume_info->password);
+		}
+		kfree(volume_info->UNC);
+		kfree(volume_info->prepath);
+		kfree(volume_info);
 	}
-	kfree(volume_info.UNC);
-	kfree(volume_info.prepath);
 	FreeXid(xid);
 	return rc;
 }