linux-kernel - [PATCH] net: xfrm: Fix end of loop tests for list_for_each

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Date:   Tue, 27 Jul 2021 04:58:52 +0530
From:   Harshvardhan Jha <harshvardhan.jha@...cle.com>
To:     steffen.klassert@...unet.com
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Harshvardhan Jha <harshvardhan.jha@...cle.com>
Subject: [PATCH] net: xfrm: Fix end of loop tests for list_for_each_entry

The list_for_each_entry() iterator, "pos" in this code, can never be
NULL so the warning will never be printed.

Signed-off-by: Harshvardhan Jha <harshvardhan.jha@...cle.com>
---
>From static analysis.  Not tested.
---
 net/xfrm/xfrm_ipcomp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index 2e8afe078d61..cb40ff0ff28d 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -241,7 +241,7 @@ static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms)
 			break;
 	}
 
-	WARN_ON(!pos);
+	WARN_ON(list_entry_is_head(pos, &ipcomp_tfms_list, list));
 
 	if (--pos->users)
 		return;
-- 
2.32.0