linux-kernel - [PATCH net-next] xfrm: Remove unnecessary NULL check in xfrm_lookup_with

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Message-ID: <2eebea1e-5258-4bcb-9127-ca4d7c59e0e2@stanley.mountain>
Date: Wed, 12 Mar 2025 20:21:13 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Steffen Klassert <steffen.klassert@...unet.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] xfrm: Remove unnecessary NULL check in
 xfrm_lookup_with_ifid()

This NULL check is unnecessary and can be removed.  It confuses
Smatch static analysis tool because it makes Smatch think that
xfrm_lookup_with_ifid() can return a mix of NULL pointers and errors so
it creates a lot of false positives.  Remove it.

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
I have wanted to remove this NULL check for a long time.  Someone
said it could be done safely.  But please, please, review this
carefully.

 net/xfrm/xfrm_policy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 6551e588fe52..30970d40a454 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3294,7 +3294,7 @@ struct dst_entry *xfrm_lookup_with_ifid(struct net *net,
 
 ok:
 	xfrm_pols_put(pols, drop_pols);
-	if (dst && dst->xfrm &&
+	if (dst->xfrm &&
 	    (dst->xfrm->props.mode == XFRM_MODE_TUNNEL ||
 	     dst->xfrm->props.mode == XFRM_MODE_IPTFS))
 		dst->flags |= DST_XFRM_TUNNEL;
-- 
2.47.2