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[CIFS] properly account for new user= field in SPNEGO upcall string allocation 

...it doesn't look like it's being accounted for at the moment. Also
try to reorganize the calculation to make it a little more evident
what each piece means.

This should probably go to the stable series as well...

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2008-08-01 17:54:32 +00:00 committed by Steve French
parent 2f0e58ac3a
commit 66b8bd3c40
1 changed files with 11 additions and 7 deletions
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18
fs/cifs/cifs_spnego.c
View File

@ -66,8 +66,8 @@ struct key_type cifs_spnego_key_type = {
.describe = user_describe,
};
#define MAX_VER_STR_LEN 9 /* length of longest version string e.g.
strlen(";ver=0xFF") */
#define MAX_VER_STR_LEN 8 /* length of longest version string e.g.
strlen("ver=0xFF") */
#define MAX_MECH_STR_LEN 13 /* length of longest security mechanism name, eg
in future could have strlen(";sec=ntlmsspi") */
#define MAX_IPV6_ADDR_LEN 42 /* eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/60 */
@ -81,11 +81,15 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
struct key *spnego_key;
const char *hostname = server->hostname;
/* BB: come up with better scheme for determining length */
/* length of fields (with semicolons): ver=0xyz ipv4= ipaddress host=
hostname sec=mechanism uid=0x uid */
desc_len = MAX_VER_STR_LEN + 5 + MAX_IPV6_ADDR_LEN + 1 + 6 +
strlen(hostname) + MAX_MECH_STR_LEN + 8 + (sizeof(uid_t) * 2);
/* length of fields (with semicolons): ver=0xyz ip4=ipaddress
host=hostname sec=mechanism uid=0xFF user=username */
desc_len = MAX_VER_STR_LEN +
6 /* len of "host=" */ + strlen(hostname) +
5 /* len of ";ipv4=" */ + MAX_IPV6_ADDR_LEN +
MAX_MECH_STR_LEN +
7 /* len of ";uid=0x" */ + (sizeof(uid_t) * 2) +
6 /* len of ";user=" */ + strlen(sesInfo->userName) + 1;
spnego_key = ERR_PTR(-ENOMEM);
description = kzalloc(desc_len, GFP_KERNEL);
if (description == NULL)