[077/190] Revert "rapidio: fix a NULL pointer dereference when create_workqueue() fails"
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Message ID 20210421130105.1226686-78-gregkh@linuxfoundation.org
State New, archived
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Series
  • Revertion of all of the umn.edu commits
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Commit Message

Greg KH April 21, 2021, 12:59 p.m. UTC
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@umn.edu>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/rapidio/rio_cm.c | 8 --------
 1 file changed, 8 deletions(-)

Comments

Greg KH April 27, 2021, 5:39 p.m. UTC | #1
On Wed, Apr 21, 2021 at 02:59:12PM +0200, Greg Kroah-Hartman wrote:
> 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@umn.edu>
> Cc: Alexandre Bounine <alex.bou9@gmail.com>
> Cc: Matt Porter <mporter@kernel.crashing.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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
> 

This patch has a memory leak on the error path here, it does not clean
up everything properly.  So I'll keep the revert and fix it up properly
in a follow-on patch.

thanks,

greg k-h

Patch
diff mbox series

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;