diff mbox series

[09/10] xfrm Fix use after free in __xfrm6_udp_encap_rcv.

Message ID 20231028084328.3119236-10-steffen.klassert@secunet.com (mailing list archive)
State Accepted
Commit 53a5b4f2ea858482a427878bca988a7fa9b2ebdc
Delegated to: Netdev Maintainers
Headers show
Series [01/10] xfrm: Remove unused function declarations | expand

Checks

Context Check Description
netdev/series_format success Pull request is its own cover letter
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1364 this patch: 1364
netdev/cc_maintainers warning 3 maintainers not CCed: edumazet@google.com pabeni@redhat.com dsahern@kernel.org
netdev/build_clang success Errors and warnings before: 1388 this patch: 1388
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes fail Problems with Fixes tag: 1
netdev/build_allmodconfig_warn success Errors and warnings before: 1389 this patch: 1389
netdev/checkpatch warning WARNING: Unknown commit id '221ddb723d90', maybe rebased or not pulled?
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Steffen Klassert Oct. 28, 2023, 8:43 a.m. UTC 
A recent patch changed xfrm6_udp_encap_rcv to not
free the skb itself anymore but fogot the case
where xfrm4_udp_encap_rcv is called subsequently.

Fix this by moving the call to xfrm4_udp_encap_rcv
from __xfrm6_udp_encap_rcv to xfrm6_udp_encap_rcv.

Fixes: 221ddb723d90 ("xfrm: Support GRO for IPv6 ESP in UDP encapsulation")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
 net/ipv4/xfrm4_input.c | 3 ++-
 net/ipv6/xfrm6_input.c | 9 ++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 42879c5e026a..c54676998eb6 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -159,7 +159,6 @@  static int __xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb, bool pull
 	/* process ESP */
 	return 0;
 }
-EXPORT_SYMBOL(xfrm4_udp_encap_rcv);
 
 /* If it's a keepalive packet, then just eat it.
  * If it's an encapsulated packet, then pass it to the
@@ -184,6 +183,7 @@  int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
 
 	return ret;
 }
+EXPORT_SYMBOL(xfrm4_udp_encap_rcv);
 
 struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
 					struct sk_buff *skb)
@@ -223,6 +223,7 @@  struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
 
 	return NULL;
 }
+EXPORT_SYMBOL(xfrm4_gro_udp_encap_rcv);
 
 int xfrm4_rcv(struct sk_buff *skb)
 {
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index ccf79b84c061..6e36e5047fba 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -80,9 +80,6 @@  static int __xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb, bool pull
 	__be32 *udpdata32;
 	u16 encap_type;
 
-	if (skb->protocol == htons(ETH_P_IP))
-		return xfrm4_udp_encap_rcv(sk, skb);
-
 	encap_type = READ_ONCE(up->encap_type);
 	/* if this is not encapsulated socket, then just return now */
 	if (!encap_type)
@@ -169,6 +166,9 @@  int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
 {
 	int ret;
 
+	if (skb->protocol == htons(ETH_P_IP))
+		return xfrm4_udp_encap_rcv(sk, skb);
+
 	ret = __xfrm6_udp_encap_rcv(sk, skb, true);
 	if (!ret)
 		return xfrm6_rcv_encap(skb, IPPROTO_ESP, 0,
@@ -190,6 +190,9 @@  struct sk_buff *xfrm6_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
 	struct sk_buff *pp = NULL;
 	int ret;
 
+	if (skb->protocol == htons(ETH_P_IP))
+		return xfrm4_gro_udp_encap_rcv(sk, head, skb);
+
 	offset = offset - sizeof(struct udphdr);
 
 	if (!pskb_pull(skb, offset))