Patch "cxl: Fix error path on bad ioctl" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    cxl: Fix error path on bad ioctl

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cxl-fix-error-path-on-bad-ioctl.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cec422c11caeeccae709e9942058b6b644ce434c Mon Sep 17 00:00:00 2001
From: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Date: Tue, 6 Jun 2017 11:43:41 +0200
Subject: cxl: Fix error path on bad ioctl

From: Frederic Barrat <fbarrat@linux.vnet.ibm.com>

commit cec422c11caeeccae709e9942058b6b644ce434c upstream.

Fix error path if we can't copy user structure on CXL_IOCTL_START_WORK
ioctl. We shouldn't unlock the context status mutex as it was not
locked (yet).

Fixes: 0712dc7e73e5 ("cxl: Fix issues when unmapping contexts")
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/misc/cxl/file.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/drivers/misc/cxl/file.c
+++ b/drivers/misc/cxl/file.c
@@ -158,11 +158,8 @@ static long afu_ioctl_start_work(struct
 
 	/* Do this outside the status_mutex to avoid a circular dependency with
 	 * the locking in cxl_mmap_fault() */
-	if (copy_from_user(&work, uwork,
-			   sizeof(struct cxl_ioctl_start_work))) {
-		rc = -EFAULT;
-		goto out;
-	}
+	if (copy_from_user(&work, uwork, sizeof(work)))
+		return -EFAULT;
 
 	mutex_lock(&ctx->status_mutex);
 	if (ctx->status != OPENED) {


Patches currently in stable-queue which might be from fbarrat@linux.vnet.ibm.com are

queue-4.4/cxl-fix-error-path-on-bad-ioctl.patch