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_receive handlers
to the 5.10-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_re.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c739ec8b899f64b70e09f9a5f6707406f9f941fd
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue Nov 23 14:56:07 2021 -0800
gro: remove rcu_read_lock/rcu_read_unlock from gro_receive handlers
[ Upstream commit fc1ca3348a74a1afaa7ffebc2b2f2cc149e11278 ]
All gro_receive() handlers are called from dev_gro_receive()
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 af35361a3dce..17989688f54b 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -528,18 +528,15 @@ static struct sk_buff *geneve_gro_receive(struct sock *sk,
type = gh->proto_type;
- rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype)
- goto out_unlock;
+ goto out;
skb_gro_pull(skb, gh_len);
skb_gro_postpull_rcsum(skb, gh, gh_len);
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
flush = 0;
-out_unlock:
- rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 43aea97c5762..ff0d3fc82c0f 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -482,10 +482,9 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head,
type = vhdr->h_vlan_encapsulated_proto;
- rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype)
- goto out_unlock;
+ goto out;
flush = 0;
@@ -504,8 +503,6 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head,
skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
-out_unlock:
- rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 61cb40368723..2b0eb24199d6 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -430,19 +430,16 @@ struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
type = eh->h_proto;
- rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (ptype == NULL) {
flush = 1;
- goto out_unlock;
+ goto out;
}
skb_gro_pull(skb, sizeof(*eh));
skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
-out_unlock:
- rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index ce42626663de..cac63bb20c16 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1471,19 +1471,18 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
proto = iph->protocol;
- rcu_read_lock();
ops = rcu_dereference(inet_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive)
- goto out_unlock;
+ goto out;
if (*(u8 *)iph != 0x45)
- goto out_unlock;
+ goto out;
if (ip_is_fragment(iph))
- goto out_unlock;
+ goto out;
if (unlikely(ip_fast_csum((u8 *)iph, 5)))
- goto out_unlock;
+ goto out;
id = ntohl(*(__be32 *)&iph->id);
flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
@@ -1560,9 +1559,6 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
ops->callbacks.gro_receive, head, skb);
-out_unlock:
- rcu_read_unlock();
-
out:
skb_gro_flush_final(skb, pp, flush);
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index 8fcbc6258ec5..5aacc75e495c 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -246,17 +246,14 @@ static struct sk_buff *fou_gro_receive(struct sock *sk,
/* Flag this frame as already having an outer encap header */
NAPI_GRO_CB(skb)->is_fou = 1;
- rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (!ops || !ops->callbacks.gro_receive)
- goto out_unlock;
+ goto out;
pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
-out_unlock:
- rcu_read_unlock();
-
+out:
return pp;
}
@@ -438,17 +435,14 @@ static struct sk_buff *gue_gro_receive(struct sock *sk,
/* Flag this frame as already having an outer encap header */
NAPI_GRO_CB(skb)->is_fou = 1;
- rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
- goto out_unlock;
+ goto out;
pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
flush = 0;
-out_unlock:
- rcu_read_unlock();
out:
skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index e0a246575887..e9dabf1affe9 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -158,10 +158,9 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
type = greh->protocol;
- rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype)
- goto out_unlock;
+ goto out;
grehlen = GRE_HEADER_SECTION;
@@ -175,13 +174,13 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
if (skb_gro_header_hard(skb, hlen)) {
greh = skb_gro_header_slow(skb, hlen, off);
if (unlikely(!greh))
- goto out_unlock;
+ goto out;
}
/* Don't bother verifying checksum if we're going to flush anyway. */
if ((greh->flags & GRE_CSUM) && !NAPI_GRO_CB(skb)->flush) {
if (skb_gro_checksum_simple_validate(skb))
- goto out_unlock;
+ goto out;
skb_gro_checksum_try_convert(skb, IPPROTO_GRE,
null_compute_pseudo);
@@ -225,8 +224,6 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
flush = 0;
-out_unlock:
- rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 57168d4fa195..418da7a8a075 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -606,13 +606,11 @@ struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb)
inet_gro_compute_pseudo);
skip:
NAPI_GRO_CB(skb)->is_ipv6 = 0;
- rcu_read_lock();
if (static_branch_unlikely(&udp_encap_needed_key))
sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest);
pp = udp_gro_receive(head, skb, uh, sk);
- rcu_read_unlock();
return pp;
flush:
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 15c8eef1ef44..f67921e0dd56 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -209,7 +209,6 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
flush += ntohs(iph->payload_len) != skb_gro_len(skb);
- rcu_read_lock();
proto = iph->nexthdr;
ops = rcu_dereference(inet6_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive) {
@@ -222,7 +221,7 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
ops = rcu_dereference(inet6_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive)
- goto out_unlock;
+ goto out;
iph = ipv6_hdr(skb);
}
@@ -280,9 +279,6 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
pp = indirect_call_gro_receive_l4(tcp6_gro_receive, udp6_gro_receive,
ops->callbacks.gro_receive, head, skb);
-out_unlock:
- rcu_read_unlock();
-
out:
skb_gro_flush_final(skb, pp, flush);
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 7752e1e921f8..1107782c083d 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -144,13 +144,11 @@ struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb)
skip:
NAPI_GRO_CB(skb)->is_ipv6 = 1;
- rcu_read_lock();
if (static_branch_unlikely(&udpv6_encap_needed_key))
sk = udp6_gro_lookup_skb(skb, uh->source, uh->dest);
pp = udp_gro_receive(head, skb, uh, sk);
- rcu_read_unlock();
return pp;
flush:
