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net: drop write-only stack variable 

Remove a write-only stack variable from unix_attach_fds(). This is a
left-over from the security fix in:

    commit 712f4aad40
    Author: willy tarreau <w@1wt.eu>
    Date:   Sun Jan 10 07:54:56 2016 +0100

        unix: properly account for FDs passed over unix sockets

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Herrmann 2016-02-02 18:17:54 +01:00 committed by David S. Miller
parent 67eb03318b
commit 3575dbf2cb
1 changed files with 1 additions and 4 deletions
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5
net/unix/af_unix.c
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@ -1534,7 +1534,6 @@ static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
{ {
int i; int i;
unsigned char max_level = 0; unsigned char max_level = 0;
int unix_sock_count = 0;
if (too_many_unix_fds(current)) if (too_many_unix_fds(current))
return -ETOOMANYREFS; return -ETOOMANYREFS;
@ -1542,12 +1541,10 @@ static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
for (i = scm->fp->count - 1; i >= 0; i--) { for (i = scm->fp->count - 1; i >= 0; i--) {
struct sock *sk = unix_get_socket(scm->fp->fp[i]); struct sock *sk = unix_get_socket(scm->fp->fp[i]);
if (sk) { if (sk)
unix_sock_count++;
max_level = max(max_level, max_level = max(max_level,
unix_sk(sk)->recursion_level); unix_sk(sk)->recursion_level);
} }
}
if (unlikely(max_level > MAX_RECURSION_LEVEL)) if (unlikely(max_level > MAX_RECURSION_LEVEL))
return -ETOOMANYREFS; return -ETOOMANYREFS;