netdev - [PATCH net 6/7] chtls: Added a check to avoid NULL pointer dereference

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Message-Id: <20210106042912.23512-7-ayush.sawal@chelsio.com>
Date:   Wed,  6 Jan 2021 09:59:11 +0530
From:   Ayush Sawal <ayush.sawal@...lsio.com>
To:     kuba@...nel.org, netdev@...r.kernel.org, davem@...emloft.net
Cc:     secdev@...lsio.com, Ayush Sawal <ayush.sawal@...lsio.com>,
        Vinay Kumar Yadav <vinay.yadav@...lsio.com>
Subject: [PATCH net 6/7] chtls: Added a check to avoid NULL pointer dereference

In case of server removal lookup_stid() may return NULL pointer, which
is used as listen_ctx. So added a check before accessing this pointer.

Fixes: cc35c88ae4db ("crypto : chtls - CPL handler definition")
Signed-off-by: Vinay Kumar Yadav <vinay.yadav@...lsio.com>
Signed-off-by: Ayush Sawal <ayush.sawal@...lsio.com>
---
 drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
index ff3969a24d74..1c6d3c93a0c8 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
@@ -1597,6 +1597,11 @@ static int chtls_pass_establish(struct chtls_dev *cdev, struct sk_buff *skb)
 			sk_wake_async(sk, 0, POLL_OUT);
 
 		data = lookup_stid(cdev->tids, stid);
+		if (!data) {
+			/* listening server close */
+			kfree_skb(skb);
+			goto unlock;
+		}
 		lsk = ((struct listen_ctx *)data)->lsk;
 
 		bh_lock_sock(lsk);
-- 
2.28.0.rc1.6.gae46588