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cifs: fix IPv6 address length check

For IPv6 the userspace mount helper sends an address in the "ip="
option.  This check fails if the length is > 35 characters. I have no
idea where the magic 35 character limit came from, but it's clearly not
enough for IPv6. Fix it by making it use the INET6_ADDRSTRLEN #define.

While we're at it, use the same #define for the address length in SPNEGO
upcalls.

Reported-by: Charles R. Anderson <cra@wpi.edu>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
master
Jeff Layton 13 years ago
committed by Steve French
parent
commit
50b64e3b77
  1. 6
      fs/cifs/cifs_spnego.c
  2. 4
      fs/cifs/connect.c

6
fs/cifs/cifs_spnego.c

@ -23,6 +23,7 @@
#include <linux/string.h>
#include <keys/user-type.h>
#include <linux/key-type.h>
#include <linux/inet.h>
#include "cifsglob.h"
#include "cifs_spnego.h"
#include "cifs_debug.h"
@ -73,9 +74,6 @@ struct key_type cifs_spnego_key_type = {
* strlen(";sec=ntlmsspi") */
#define MAX_MECH_STR_LEN 13
/* max possible addr len eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/128 */
#define MAX_IPV6_ADDR_LEN 43
/* strlen of "host=" */
#define HOST_KEY_LEN 5
@ -102,7 +100,7 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
host=hostname sec=mechanism uid=0xFF user=username */
desc_len = MAX_VER_STR_LEN +
HOST_KEY_LEN + strlen(hostname) +
IP_KEY_LEN + MAX_IPV6_ADDR_LEN +
IP_KEY_LEN + INET6_ADDRSTRLEN +
MAX_MECH_STR_LEN +
UID_KEY_LEN + (sizeof(uid_t) * 2) +
USER_KEY_LEN + strlen(sesInfo->userName) + 1;

4
fs/cifs/connect.c

@ -35,6 +35,7 @@
#include <linux/namei.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <linux/inet.h>
#include <net/ipv6.h>
#include "cifspdu.h"
#include "cifsglob.h"
@ -960,7 +961,8 @@ cifs_parse_mount_options(char *options, const char *devname,
} else if (strnicmp(data, "ip", 2) == 0) {
if (!value || !*value) {
vol->UNCip = NULL;
} else if (strnlen(value, 35) < 35) {
} else if (strnlen(value, INET6_ADDRSTRLEN) <
INET6_ADDRSTRLEN) {
vol->UNCip = value;
} else {
printk(KERN_WARNING "CIFS: ip address "

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