[PATCH] s390: qeth driver fixes [2/6]

[PATCH 5/9] s390: qeth driver fixes [2/6]

From: Frank Pavlic <fpavlic@de.ibm.com>
	- fixed error handling in create_device_attributes
	- fixed some minor bugs in IPv4
	  and IPv6 address checking
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/s390/net/qeth.h

@@ -1096,10 +1096,11 @@ qeth_string_to_ipaddr4(const char *buf, __u8 *addr)
 {
 	int count = 0, rc = 0;
 	int in[4];
+	char c;
 
-	rc = sscanf(buf, "%d.%d.%d.%d%n",
-		    &in[0], &in[1], &in[2], &in[3], &count);
-	if (rc != 4  || count<=0)
+	rc = sscanf(buf, "%u.%u.%u.%u%c",
+		    &in[0], &in[1], &in[2], &in[3], &c);
+	if (rc != 4 && (rc != 5 || c != '\n'))
 		return -EINVAL;
 	for (count = 0; count < 4; count++) {
 		if (in[count] > 255)
@@ -1123,24 +1124,28 @@ qeth_ipaddr6_to_string(const __u8 *addr, char *buf)
 static inline int
 qeth_string_to_ipaddr6(const char *buf, __u8 *addr)
 {
-	char *end, *start;
+	const char *end, *end_tmp, *start;
 	__u16 *in;
         char num[5];
         int num2, cnt, out, found, save_cnt;
         unsigned short in_tmp[8] = {0, };
 
 	cnt = out = found = save_cnt = num2 = 0;
-        end = start = (char *) buf;
+        end = start = buf;
 	in = (__u16 *) addr;
 	memset(in, 0, 16);
-        while (end) {
-                end = strchr(end,':');
+        while (*end) {
+                end = strchr(start,':');
                 if (end == NULL) {
-                        end = (char *)buf + (strlen(buf));
+                        end = buf + strlen(buf);
+			if ((end_tmp = strchr(start, '\n')) != NULL)
+				end = end_tmp;
 			out = 1;
                 }
                 if ((end - start)) {
                         memset(num, 0, 5);
+			if ((end - start) > 4)
+				return -EINVAL;
                         memcpy(num, start, end - start);
 			if (!qeth_isxdigit(num))
 				return -EINVAL;
@@ -1158,6 +1163,8 @@ qeth_string_to_ipaddr6(const char *buf, __u8 *addr)
 		}
 		start = ++end;
         }
+	if (cnt + save_cnt > 8)
+		return -EINVAL;
         cnt = 7;
 	while (save_cnt)
                 in[cnt--] = in_tmp[--save_cnt];

drivers/s390/net/qeth_sys.c

@@ -1110,12 +1110,12 @@ qeth_parse_ipatoe(const char* buf, enum qeth_prot_versions proto,
 {
 	const char *start, *end;
 	char *tmp;
-	char buffer[49] = {0, };
+	char buffer[40] = {0, };
 
 	start = buf;
 	/* get address string */
 	end = strchr(start, '/');
-	if (!end || (end-start >= 49)){
+	if (!end || (end - start >= 40)){
 		PRINT_WARN("Invalid format for ipato_addx/delx. "
 			   "Use <ip addr>/<mask bits>\n");
 		return -EINVAL;
@@ -1127,7 +1127,12 @@ qeth_parse_ipatoe(const char* buf, enum qeth_prot_versions proto,
 	}
 	start = end + 1;
 	*mask_bits = simple_strtoul(start, &tmp, 10);
-
+	if (!strlen(start) ||
+	    (tmp == start) ||
+	    (*mask_bits > ((proto == QETH_PROT_IPV4) ? 32 : 128))) {
+		PRINT_WARN("Invalid mask bits for ipato_addx/delx !\n");
+		return -EINVAL;
+	}
 	return 0;
 }
 
@@ -1698,11 +1703,16 @@ qeth_create_device_attributes(struct device *dev)
 		sysfs_remove_group(&dev->kobj, &qeth_device_attr_group);
 		sysfs_remove_group(&dev->kobj, &qeth_device_ipato_group);
 		sysfs_remove_group(&dev->kobj, &qeth_device_vipa_group);
-	}
-	if ((ret = sysfs_create_group(&dev->kobj, &qeth_device_blkt_group)))
 		return ret;
-
+	}
+	if ((ret = sysfs_create_group(&dev->kobj, &qeth_device_blkt_group))){
+		sysfs_remove_group(&dev->kobj, &qeth_device_attr_group);
+		sysfs_remove_group(&dev->kobj, &qeth_device_ipato_group);
+		sysfs_remove_group(&dev->kobj, &qeth_device_vipa_group);
+		sysfs_remove_group(&dev->kobj, &qeth_device_rxip_group);
 		return ret;
+	}
+	return 0;
 }
 
 void