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authorYan, Zheng <zheng.z.yan@intel.com>2011-09-29 17:10:10 +0000
committerDavid S. Miller <davem@davemloft.net>2011-10-04 23:31:24 -0400
commit260fcbeb1ae9e768a44c9925338fbacb0d7e5ba9 (patch)
tree741dea73d68eca24c8d515bb7091cbedb77192a4
parentcb2d0f3e968bff7c6d262aca3e3ab8d4184e69b2 (diff)
downloadlinux-stericsson-260fcbeb1ae9e768a44c9925338fbacb0d7e5ba9.tar.gz
tcp: properly handle md5sig_pool references
tcp_v4_clear_md5_list() assumes that multiple tcp md5sig peers only hold one reference to md5sig_pool. but tcp_v4_md5_do_add() increases use count of md5sig_pool for each peer. This patch makes tcp_v4_md5_do_add() only increases use count for the first tcp md5sig peer. Signed-off-by: Zheng Yan <zheng.z.yan@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_ipv4.c11
-rw-r--r--net/ipv6/tcp_ipv6.c8
2 files changed, 12 insertions, 7 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index c34f01513945..7963e03f1068 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -927,18 +927,21 @@ int tcp_v4_md5_do_add(struct sock *sk, __be32 addr,
}
sk_nocaps_add(sk, NETIF_F_GSO_MASK);
}
- if (tcp_alloc_md5sig_pool(sk) == NULL) {
+
+ md5sig = tp->md5sig_info;
+ if (md5sig->entries4 == 0 &&
+ tcp_alloc_md5sig_pool(sk) == NULL) {
kfree(newkey);
return -ENOMEM;
}
- md5sig = tp->md5sig_info;
if (md5sig->alloced4 == md5sig->entries4) {
keys = kmalloc((sizeof(*keys) *
(md5sig->entries4 + 1)), GFP_ATOMIC);
if (!keys) {
kfree(newkey);
- tcp_free_md5sig_pool();
+ if (md5sig->entries4 == 0)
+ tcp_free_md5sig_pool();
return -ENOMEM;
}
@@ -982,6 +985,7 @@ int tcp_v4_md5_do_del(struct sock *sk, __be32 addr)
kfree(tp->md5sig_info->keys4);
tp->md5sig_info->keys4 = NULL;
tp->md5sig_info->alloced4 = 0;
+ tcp_free_md5sig_pool();
} else if (tp->md5sig_info->entries4 != i) {
/* Need to do some manipulation */
memmove(&tp->md5sig_info->keys4[i],
@@ -989,7 +993,6 @@ int tcp_v4_md5_do_del(struct sock *sk, __be32 addr)
(tp->md5sig_info->entries4 - i) *
sizeof(struct tcp4_md5sig_key));
}
- tcp_free_md5sig_pool();
return 0;
}
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 79cc6469508d..7b8fc5794352 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -591,7 +591,8 @@ static int tcp_v6_md5_do_add(struct sock *sk, const struct in6_addr *peer,
}
sk_nocaps_add(sk, NETIF_F_GSO_MASK);
}
- if (tcp_alloc_md5sig_pool(sk) == NULL) {
+ if (tp->md5sig_info->entries6 == 0 &&
+ tcp_alloc_md5sig_pool(sk) == NULL) {
kfree(newkey);
return -ENOMEM;
}
@@ -600,8 +601,9 @@ static int tcp_v6_md5_do_add(struct sock *sk, const struct in6_addr *peer,
(tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
if (!keys) {
- tcp_free_md5sig_pool();
kfree(newkey);
+ if (tp->md5sig_info->entries6 == 0)
+ tcp_free_md5sig_pool();
return -ENOMEM;
}
@@ -647,6 +649,7 @@ static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer)
kfree(tp->md5sig_info->keys6);
tp->md5sig_info->keys6 = NULL;
tp->md5sig_info->alloced6 = 0;
+ tcp_free_md5sig_pool();
} else {
/* shrink the database */
if (tp->md5sig_info->entries6 != i)
@@ -655,7 +658,6 @@ static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer)
(tp->md5sig_info->entries6 - i)
* sizeof (tp->md5sig_info->keys6[0]));
}
- tcp_free_md5sig_pool();
return 0;
}
}