Patch "i40iw: Do not set self-referencing pointer to NULL after kfree" has been added to the 4.7-stable tree

Patch "i40iw: Do not set self-referencing pointer to NULL after kfree" has been added to the 4.7-stable tree

[gregkh]

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

    i40iw: Do not set self-referencing pointer to NULL after kfree

to the 4.7-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:
     i40iw-do-not-set-self-referencing-pointer-to-null-after-kfree.patch
and it can be found in the queue-4.7 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 7eaf8313b1cfe93417a22bdc3f7380cac2a3dc6d Mon Sep 17 00:00:00 2001
From: Mustafa Ismail <mustafa.ismail@intel.com>
Date: Mon, 22 Aug 2016 19:01:47 -0500
Subject: i40iw: Do not set self-referencing pointer to NULL after kfree

From: Mustafa Ismail <mustafa.ismail@intel.com>

commit 7eaf8313b1cfe93417a22bdc3f7380cac2a3dc6d upstream.

In i40iw_free_virt_mem(), do not set mem->va to NULL
after freeing it as mem->va is a self-referencing pointer
to mem.

Fixes: 4e9042e647ff ("i40iw: add hw and utils files")

Reported-by: Stefan Assmann <sassmann@redhat.com>
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/hw/i40iw/i40iw_utils.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/hw/i40iw/i40iw_utils.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_utils.c
@@ -673,8 +673,11 @@ enum i40iw_status_code i40iw_free_virt_m
 {
 	if (!mem)
 		return I40IW_ERR_PARAM;
+	/*
+	 * mem->va points to the parent of mem, so both mem and mem->va
+	 * can not be touched once mem->va is freed
+	 */
 	kfree(mem->va);
-	mem->va = NULL;
 	return 0;
 }
 


Patches currently in stable-queue which might be from mustafa.ismail@intel.com are

queue-4.7/i40iw-update-hw_iwarp_state.patch
queue-4.7/i40iw-add-missing-check-for-interface-already-open.patch
queue-4.7/i40iw-fix-double-free-of-allocated_buffer.patch
queue-4.7/i40iw-receive-notification-events-correctly.patch
queue-4.7/i40iw-change-mem_resources-pointer-to-a-u8.patch
queue-4.7/i40iw-protect-req_resource_num-update.patch
queue-4.7/i40iw-add-missing-null-check-for-mpa-private-data.patch
queue-4.7/i40iw-avoid-writing-to-freed-memory.patch
queue-4.7/i40iw-do-not-set-self-referencing-pointer-to-null-after-kfree.patch