This is a note to let you know that I've just added the patch titled
gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gro-remove-rcu_read_lock-rcu_read_unlock-from-gro_co.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 986d3f32f44f8556dec475b2962986897f5a4fd1
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue Nov 23 14:56:08 2021 -0800
gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers
[ Upstream commit 627b94f75b82d13d1530b59155a545fd99d807db ]
All gro_complete() handlers are called from napi_gro_complete()
while rcu_read_lock() has been called.
There is no point stacking more rcu_read_lock()
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Stable-dep-of: 7e4196935069 ("fou: Fix null-ptr-deref in GRO.")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index eb5b7c66db93..1bff01f8b16d 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -558,13 +558,10 @@ static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
gh_len = geneve_hlen(gh);
type = gh->proto_type;
- rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
- rcu_read_unlock();
-
skb_set_inner_mac_header(skb, nhoff + gh_len);
return err;
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 40bbe08c1aa4..29c326f98743 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -520,14 +520,12 @@ static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
struct packet_offload *ptype;
int err = -ENOENT;
- rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
skb, nhoff + sizeof(*vhdr));
- rcu_read_unlock();
return err;
}
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 72841efebcb1..ab2ef6250142 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -455,14 +455,12 @@ int eth_gro_complete(struct sk_buff *skb, int nhoff)
if (skb->encapsulation)
skb_set_inner_mac_header(skb, nhoff);
- rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype != NULL)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
skb, nhoff + sizeof(*eh));
- rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(eth_gro_complete);
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index c9156e7605db..b225e049daea 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1639,10 +1639,9 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
csum_replace2(&iph->check, iph->tot_len, newlen);
iph->tot_len = newlen;
- rcu_read_lock();
ops = rcu_dereference(inet_offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
- goto out_unlock;
+ goto out;
/* Only need to add sizeof(*iph) to get to the next hdr below
* because any hdr with option will have been flushed in
@@ -1652,9 +1651,7 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
tcp4_gro_complete, udp4_gro_complete,
skb, nhoff + sizeof(*iph));
-out_unlock:
- rcu_read_unlock();
-
+out:
return err;
}
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index 5aacc75e495c..605d9673d6ec 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -265,19 +265,16 @@ static int fou_gro_complete(struct sock *sk, struct sk_buff *skb,
const struct net_offload *ops;
int err = -ENOSYS;
- rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
- goto out_unlock;
+ goto out;
err = ops->callbacks.gro_complete(skb, nhoff);
skb_set_inner_mac_header(skb, nhoff);
-out_unlock:
- rcu_read_unlock();
-
+out:
return err;
}
@@ -479,18 +476,16 @@ static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
return err;
}
- rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
- goto out_unlock;
+ goto out;
err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
skb_set_inner_mac_header(skb, nhoff + guehlen);
-out_unlock:
- rcu_read_unlock();
+out:
return err;
}
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index c12b4b2fc638..9a18fd1d5648 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -252,13 +252,10 @@ static int gre_gro_complete(struct sk_buff *skb, int nhoff)
if (greh->flags & GRE_CSUM)
grehlen += GRE_HEADER_SECTION;
- rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = ptype->callbacks.gro_complete(skb, nhoff + grehlen);
- rcu_read_unlock();
-
skb_set_inner_mac_header(skb, nhoff + grehlen);
return err;
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 0406097e7c29..feb40325f8d7 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -657,7 +657,6 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
uh->len = newlen;
- rcu_read_lock();
sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
udp4_lib_lookup_skb, skb, uh->source, uh->dest);
if (sk && udp_sk(sk)->gro_complete) {
@@ -678,7 +677,6 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
} else {
err = udp_gro_complete_segment(skb);
}
- rcu_read_unlock();
if (skb->remcsum_offload)
skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM;
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 46587894c8c9..30c56143d79b 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -329,18 +329,14 @@ INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
- rcu_read_lock();
-
nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
- goto out_unlock;
+ goto out;
err = INDIRECT_CALL_L4(ops->callbacks.gro_complete, tcp6_gro_complete,
udp6_gro_complete, skb, nhoff);
-out_unlock:
- rcu_read_unlock();
-
+out:
return err;
}
