netdev - [PATCH net] chelsio/chtls: fix a double free in chtls

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Message-ID: <X8ilb6PtBRLWiSHp@mwanda>
Date:   Thu, 3 Dec 2020 11:44:31 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ayush Sawal <ayush.sawal@...lsio.com>,
        Atul Gupta <atul.gupta@...lsio.com>
Cc:     Vinay Kumar Yadav <vinay.yadav@...lsio.com>,
        Rohit Maheshwari <rohitm@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net] chelsio/chtls: fix a double free in chtls_setkey()

The "skb" is freed by the transmit code in cxgb4_ofld_send() and we
shouldn't use it again.  But in the current code, if we hit an error
later on in the function then the clean up code will call kfree_skb(skb)
and so it causes a double free.

Set the "skb" to NULL and that makes the kfree_skb() a no-op.

Fixes: d25f2f71f653 ("crypto: chtls - Program the TLS session Key")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_hw.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_hw.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_hw.c
index 62c829023da5..a4fb463af22a 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_hw.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_hw.c
@@ -391,6 +391,7 @@ int chtls_setkey(struct chtls_sock *csk, u32 keylen,
 	csk->wr_unacked += DIV_ROUND_UP(len, 16);
 	enqueue_wr(csk, skb);
 	cxgb4_ofld_send(csk->egress_dev, skb);
+	skb = NULL;
 
 	chtls_set_scmd(csk);
 	/* Clear quiesce for Rx key */
-- 
2.29.2