netdev - [PATCH 05/10] xfrm: set err and extack on failure to create pcpu SA

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Message-ID: <20251118085344.2199815-6-steffen.klassert@secunet.com>
Date: Tue, 18 Nov 2025 09:52:38 +0100
From: Steffen Klassert <steffen.klassert@...unet.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>
CC: Herbert Xu <herbert@...dor.apana.org.au>, Steffen Klassert
	<steffen.klassert@...unet.com>, <netdev@...r.kernel.org>
Subject: [PATCH 05/10] xfrm: set err and extack on failure to create pcpu SA

From: Sabrina Dubroca <sd@...asysnail.net>

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>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 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);
-- 
2.43.0