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authorJiri Slaby <jslaby@suse.cz>2019-05-17 06:38:43 +0200
committerJiri Slaby <jslaby@suse.cz>2019-05-17 06:38:51 +0200
commit03d992d2ab9bf98d32019a772f1ce2f227d9922f (patch)
treed08346029a64a7cf8c2a9510a9bbc37327841967
parent242c5a4a8523e3a7862f24b85272d9f3bb13f365 (diff)
tuntap: fix dividing by zero in ebpf queue selection
-rw-r--r--drivers/net/tun.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e9ca1c088d0b..dc62fc3c5a95 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -596,13 +596,18 @@ static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb)
static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb)
{
struct tun_prog *prog;
+ u32 numqueues;
u16 ret = 0;
+ numqueues = READ_ONCE(tun->numqueues);
+ if (!numqueues)
+ return 0;
+
prog = rcu_dereference(tun->steering_prog);
if (prog)
ret = bpf_prog_run_clear_cb(prog->prog, skb);
- return ret % tun->numqueues;
+ return ret % numqueues;
}
static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb,