linux-kernel - [PATCH 077/190] Revert "rapidio: fix a NULL pointer dereference when create

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Message-Id: <20210421130105.1226686-78-gregkh@linuxfoundation.org>
Date:   Wed, 21 Apr 2021 14:59:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kangjie Lu <kjlu@....edu>,
        Alexandre Bounine <alex.bou9@...il.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 077/190] Revert "rapidio: fix a NULL pointer dereference when create_workqueue() fails"

This reverts commit 23015b22e47c5409620b1726a677d69e5cd032ba.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes.  The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix.  Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Kangjie Lu <kjlu@....edu>
Cc: Alexandre Bounine <alex.bou9@...il.com>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/rapidio/rio_cm.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/rapidio/rio_cm.c b/drivers/rapidio/rio_cm.c
index 50ec53d67a4c..e6c16f04f2b4 100644
--- a/drivers/rapidio/rio_cm.c
+++ b/drivers/rapidio/rio_cm.c
@@ -2138,14 +2138,6 @@ static int riocm_add_mport(struct device *dev,
 	mutex_init(&cm->rx_lock);
 	riocm_rx_fill(cm, RIOCM_RX_RING_SIZE);
 	cm->rx_wq = create_workqueue(DRV_NAME "/rxq");
-	if (!cm->rx_wq) {
-		riocm_error("failed to allocate IBMBOX_%d on %s",
-			    cmbox, mport->name);
-		rio_release_outb_mbox(mport, cmbox);
-		kfree(cm);
-		return -ENOMEM;
-	}
-
 	INIT_WORK(&cm->rx_work, rio_ibmsg_handler);

 	cm->tx_slot = 0;
-- 
2.31.1