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ip: Fix data-races around sysctl_ip_fwd_update_priority.

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While reading sysctl_ip_fwd_update_priority, it can be changed
concurrently.  Thus, we need to add READ_ONCE() to its readers.

Fixes: 432e05d328 ("net: ipv4: Control SKB reprioritization after forwarding")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima 2022-07-13 13:51:54 -07:00 committed by David S. Miller
parent 60c158dc7b
commit 7bf9e18d9a
2 changed files with 3 additions and 2 deletions
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3
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View file

@ -10523,13 +10523,14 @@ static int mlxsw_sp_dscp_init(struct mlxsw_sp *mlxsw_sp)
static int __mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
{
struct net *net = mlxsw_sp_net(mlxsw_sp);
bool usp = net->ipv4.sysctl_ip_fwd_update_priority;
char rgcr_pl[MLXSW_REG_RGCR_LEN];
u64 max_rifs;
bool usp;
if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, MAX_RIFS))
return -EIO;
max_rifs = MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_RIFS);
usp = READ_ONCE(net->ipv4.sysctl_ip_fwd_update_priority);
mlxsw_reg_rgcr_pack(rgcr_pl, true, true);
mlxsw_reg_rgcr_max_router_interfaces_set(rgcr_pl, max_rifs);

2
net/ipv4/ip_forward.c
View file

@ -157,7 +157,7 @@ int ip_forward(struct sk_buff *skb)
!skb_sec_path(skb))
ip_rt_send_redirect(skb);
if (net->ipv4.sysctl_ip_fwd_update_priority)
if (READ_ONCE(net->ipv4.sysctl_ip_fwd_update_priority))
skb->priority = rt_tos2priority(iph->tos);
return NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,