Patch "gro: remove rcu_read_lock/rcu_read_unlock from gro_receive handlers" has been added to the 5.15-stable tree

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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 5.15-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_re.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 72c2e80fcb8204e477e5fd9adb00bf367d8073ff
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 0e4ea3c0fe82..eb5b7c66db93 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -530,18 +530,15 @@ 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 8710d5d7d3c1..40bbe08c1aa4 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -483,10 +483,9 @@ 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;
 
@@ -508,8 +507,6 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head,
 					    ipv6_gro_receive, inet_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 9ad4a15232af..72841efebcb1 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -425,11 +425,10 @@ 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));
@@ -439,8 +438,6 @@ struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
 					    ipv6_gro_receive, inet_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 20cdd0efb95b..c9156e7605db 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1477,19 +1477,18 @@ 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));
@@ -1566,9 +1565,6 @@ 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 1121a9d5fed9..c12b4b2fc638 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -162,10 +162,9 @@ 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;
 
@@ -179,13 +178,13 @@ 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);
@@ -229,8 +228,6 @@ 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 c61268849948..0406097e7c29 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -618,13 +618,11 @@ 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 172565d12570..46587894c8c9 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -210,7 +210,6 @@ 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) {
@@ -223,7 +222,7 @@ 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);
 	}
@@ -281,9 +280,6 @@ 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 28f63c01a595..f93195fcc059 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:




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