linux-kernel - [PATCH 5.9 024/133] chelsio/chtls: fix memory leaks caused by a race

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Message-Id: <20201109125031.883324002@linuxfoundation.org>
Date:   Mon,  9 Nov 2020 13:54:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Vinay Kumar Yadav <vinay.yadav@...lsio.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.9 024/133] chelsio/chtls: fix memory leaks caused by a race

From: Vinay Kumar Yadav <vinay.yadav@...lsio.com>

[ Upstream commit 8080b462b6aa856ae05ea010441a702599e579f2 ]

race between user context and softirq causing memleak,
consider the call sequence scenario

chtls_setkey()         //user context
chtls_peer_close()
chtls_abort_req_rss()
chtls_setkey()         //user context

work request skb queued in chtls_setkey() won't be freed
because resources are already cleaned for this connection,
fix it by not queuing work request while socket is closing.

v1->v2:
- fix W=1 warning.

v2->v3:
- separate it out from another memleak fix.

Fixes: cc35c88ae4db ("crypto : chtls - CPL handler definition")
Signed-off-by: Vinay Kumar Yadav <vinay.yadav@...lsio.com>
Link: https://lore.kernel.org/r/20201102173650.24754-1-vinay.yadav@chelsio.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/crypto/chelsio/chtls/chtls_hw.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/crypto/chelsio/chtls/chtls_hw.c
+++ b/drivers/crypto/chelsio/chtls/chtls_hw.c
@@ -383,6 +383,9 @@ int chtls_setkey(struct chtls_sock *csk,
 	if (ret)
 		goto out_notcb;
 
+	if (unlikely(csk_flag(sk, CSK_ABORT_SHUTDOWN)))
+		goto out_notcb;
+
 	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->tlshws.txqid);
 	csk->wr_credits -= DIV_ROUND_UP(len, 16);
 	csk->wr_unacked += DIV_ROUND_UP(len, 16);