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authorThomas Graf <tgraf@suug.ch>2014-08-07 03:18:47 +0400
committerDavid S. Miller <davem@davemloft.net>2014-08-07 06:17:44 +0400
commit6c8f7e70837468da4e658080d4448930fb597e1b (patch)
treeb16af5d1fcabe792f0b565d9fca2686cad480efd /net/netlink/diag.c
parent9ea88a153001ffeb3d8810917e8eea62ca9b6f25 (diff)
downloadlinux-6c8f7e70837468da4e658080d4448930fb597e1b.tar.xz
netlink: hold nl_sock_hash_lock during diag dump
Although RCU protection would be possible during diag dump, doing so allows for concurrent table mutations which can render the in-table offset between individual Netlink messages invalid and thus cause legitimate sockets to be skipped in the dump. Since the diag dump is relatively low volume and consistency is more important than performance, the table mutex is held during dump. Reported-by: Andrey Wagin <avagin@gmail.com> Signed-off-by: Thomas Graf <tgraf@suug.ch> Fixes: e341694e3eb57fc ("netlink: Convert netlink_lookup() to use RCU protected hash table") Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/diag.c')
-rw-r--r--net/netlink/diag.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netlink/diag.c b/net/netlink/diag.c
index 7301850eb56f..de8c74a3c061 100644
--- a/net/netlink/diag.c
+++ b/net/netlink/diag.c
@@ -170,6 +170,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
req = nlmsg_data(cb->nlh);
+ mutex_lock(&nl_sk_hash_lock);
read_lock(&nl_table_lock);
if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
@@ -183,6 +184,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
} else {
if (req->sdiag_protocol >= MAX_LINKS) {
read_unlock(&nl_table_lock);
+ mutex_unlock(&nl_sk_hash_lock);
return -ENOENT;
}
@@ -190,6 +192,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
}
read_unlock(&nl_table_lock);
+ mutex_unlock(&nl_sk_hash_lock);
return skb->len;
}