netdev - [PATCH ipsec 5/6] xfrm: set err and extack on failure to create pcpu SA

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Message-ID: <f4a269dc8a130b18dc6fc8897f76d302465ccb79.1760610268.git.sd@queasysnail.net>
Date: Thu, 16 Oct 2025 12:39:16 +0200
From: Sabrina Dubroca <sd@...asysnail.net>
To: netdev@...r.kernel.org
Cc: steffen.klassert@...unet.com,
	Sabrina Dubroca <sd@...asysnail.net>,
	Antony Antony <antony.antony@...unet.com>,
	Tobias Brunner <tobias@...ongswan.org>
Subject: [PATCH ipsec 5/6] xfrm: set err and extack on failure to create pcpu SA

xfrm_state_construct can fail without setting an error if the
requested pcpu_num value is too big. Set err and add an extack message
to avoid confusing userspace.

Fixes: 1ddf9916ac09 ("xfrm: Add support for per cpu xfrm state handling.")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 net/xfrm/xfrm_user.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 010c9e6638c0..9d98cc9daa37 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -947,8 +947,11 @@ static struct xfrm_state *xfrm_state_construct(struct net *net,
 
 	if (attrs[XFRMA_SA_PCPU]) {
 		x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
-		if (x->pcpu_num >= num_possible_cpus())
+		if (x->pcpu_num >= num_possible_cpus()) {
+			err = -ERANGE;
+			NL_SET_ERR_MSG(extack, "pCPU number too big");
 			goto error;
+		}
 	}
 
 	err = __xfrm_init_state(x, extack);
-- 
2.51.0