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SUNRPC: Switch one_sock_name() to use snprintf() 

Use snprintf() in one_sock_name() to prevent overflowing the output
buffer.  If the name doesn't fit in the buffer, the buffer is filled
in with an empty string, and -ENAMETOOLONG is returned.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Chuck Lever 2009-04-23 19:32:48 -04:00 committed by J. Bruce Fields
parent 8435d34dbb
commit e7942b9f25
1 changed files with 18 additions and 7 deletions
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23
net/sunrpc/svcsock.c
View File

@ -240,22 +240,27 @@ out:
/*
* Report socket names for nfsdfs
*/
static int one_sock_name(char *buf, struct svc_sock *svsk)
static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
{
int len;
switch(svsk->sk_sk->sk_family) {
case AF_INET:
len = sprintf(buf, "ipv4 %s %pI4 %d\n",
case PF_INET:
len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
svsk->sk_sk->sk_protocol == IPPROTO_UDP ?
"udp" : "tcp",
&inet_sk(svsk->sk_sk)->rcv_saddr,
inet_sk(svsk->sk_sk)->num);
break;
default:
len = sprintf(buf, "*unknown-%d*\n",
len = snprintf(buf, remaining, "*unknown-%d*\n",
svsk->sk_sk->sk_family);
}
if (len >= remaining) {
*buf = '\0';
return -ENAMETOOLONG;
}
return len;
}
@ -282,15 +287,21 @@ int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
if (!serv)
return 0;
spin_lock_bh(&serv->sv_lock);
list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
int onelen = one_sock_name(buf+len, svsk);
int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
if (onelen < 0) {
len = onelen;
break;
}
if (toclose && strcmp(toclose, buf + len) == 0)
closesk = svsk;
else
len += onelen;
}
spin_unlock_bh(&serv->sv_lock);
if (closesk)
/* Should unregister with portmap, but you cannot
* unregister just one protocol...
@ -1195,7 +1206,7 @@ int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
sockfd_put(so);
return err;
}
return one_sock_name(name_return, svsk);
return svc_one_sock_name(svsk, name_return, len);
}
EXPORT_SYMBOL_GPL(svc_addsock);