From: Kuniyuki Iwashima kuniyu@amazon.com
mainline inclusion from mainline-v5.19-rc8 commit 7bf9e18d9a5e99e3c83482973557e9f047b051e7 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8P5HO CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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: 432e05d32892 ("net: ipv4: Control SKB reprioritization after forwarding") Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Signed-off-by: David S. Miller davem@davemloft.net
Conflicts: drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 3 ++- net/ipv4/ip_forward.c | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c index 93d662de106e..091d812ececa 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c @@ -7429,14 +7429,15 @@ static int mlxsw_sp_dscp_init(struct mlxsw_sp *mlxsw_sp)
static int __mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp) { - bool usp = init_net.ipv4.sysctl_ip_fwd_update_priority; char rgcr_pl[MLXSW_REG_RGCR_LEN]; u64 max_rifs; + bool usp; int err;
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(init_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); diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c index d5984d31ab93..e4302da633c8 100644 --- a/net/ipv4/ip_forward.c +++ b/net/ipv4/ip_forward.c @@ -144,7 +144,7 @@ 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,