ieee802154: add locking for seq numbers

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index 2106ecbf0308..ca767bde17a4 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -35,6 +35,7 @@
 #include <net/ieee802154_netdev.h>
 
 static unsigned int ieee802154_seq_num;
+static DEFINE_SPINLOCK(ieee802154_seq_lock);
 
 static struct genl_family ieee802154_coordinator_family = {
         .id             = GENL_ID_GENERATE,
@@ -57,12 +58,15 @@ static struct sk_buff *ieee802154_nl_create(int flags, u8 req)
 {
         void *hdr;
         struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+        unsigned long f;
 
         if (!msg)
                 return NULL;
 
+        spin_lock_irqsave(&ieee802154_seq_lock, f);
         hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
                         &ieee802154_coordinator_family, flags, req);
+        spin_unlock_irqrestore(&ieee802154_seq_lock, f);
         if (!hdr) {
                 nlmsg_free(msg);
                 return NULL;