netdev - [PATCH 12/13] xfrm: policy: fix null dereference

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Message-ID: <20240910065507.2436394-13-steffen.klassert@secunet.com>
Date: Tue, 10 Sep 2024 08:55:06 +0200
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 12/13] xfrm: policy: fix null dereference

From: Florian Westphal <fw@...len.de>

Julian Wiedmann says:
> +     if (!xfrm_pol_hold_rcu(ret))

Coverity spotted that ^^^ needs a s/ret/pol fix-up:

> CID 1599386:  Null pointer dereferences  (FORWARD_NULL)
> Passing null pointer "ret" to "xfrm_pol_hold_rcu", which dereferences it.

Ditch the bogus 'ret' variable.

Fixes: 563d5ca93e88 ("xfrm: switch migrate to xfrm_policy_lookup_bytype")
Reported-by: Julian Wiedmann <jwiedmann.dev@...il.com>
Closes: https://lore.kernel.org/netdev/06dc2499-c095-4bd4-aee3-a1d0e3ec87c4@gmail.com/
Signed-off-by: Florian Westphal <fw@...len.de>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_policy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 6336baa8a93c..31c14457fdaf 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -4429,7 +4429,7 @@ EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
 static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
 						    u8 dir, u8 type, struct net *net, u32 if_id)
 {
-	struct xfrm_policy *pol, *ret = NULL;
+	struct xfrm_policy *pol;
 	struct flowi fl;
 
 	memset(&fl, 0, sizeof(fl));
@@ -4465,7 +4465,7 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *
 	if (IS_ERR_OR_NULL(pol))
 		goto out_unlock;
 
-	if (!xfrm_pol_hold_rcu(ret))
+	if (!xfrm_pol_hold_rcu(pol))
 		pol = NULL;
 out_unlock:
 	rcu_read_unlock();
-- 
2.34.1