releases/4.7.7/i40iw-do-not-set-self-referencing-pointer-to-null-after-kfree.patch

   1 From 7eaf8313b1cfe93417a22bdc3f7380cac2a3dc6d Mon Sep 17 00:00:00 2001
   2 From: Mustafa Ismail <mustafa.ismail@intel.com>
   3 Date: Mon, 22 Aug 2016 19:01:47 -0500
   4 Subject: i40iw: Do not set self-referencing pointer to NULL after kfree
   5
   6 From: Mustafa Ismail <mustafa.ismail@intel.com>
   7
   8 commit 7eaf8313b1cfe93417a22bdc3f7380cac2a3dc6d upstream.
   9
  10 In i40iw_free_virt_mem(), do not set mem->va to NULL
  11 after freeing it as mem->va is a self-referencing pointer
  12 to mem.
  13
  14 Fixes: 4e9042e647ff ("i40iw: add hw and utils files")
  15
  16 Reported-by: Stefan Assmann <sassmann@redhat.com>
  17 Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
  18 Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
  19 Signed-off-by: Doug Ledford <dledford@redhat.com>
  20 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  21
  22 ---
  23  drivers/infiniband/hw/i40iw/i40iw_utils.c |    5 ++++-
  24  1 file changed, 4 insertions(+), 1 deletion(-)
  25
  26 --- a/drivers/infiniband/hw/i40iw/i40iw_utils.c
  27 +++ b/drivers/infiniband/hw/i40iw/i40iw_utils.c
  28 @@ -673,8 +673,11 @@ enum i40iw_status_code i40iw_free_virt_m
  29  {
  30         if (!mem)
  31                 return I40IW_ERR_PARAM;
  32 +       /*
  33 +        * mem->va points to the parent of mem, so both mem and mem->va
  34 +        * can not be touched once mem->va is freed
  35 +        */
  36         kfree(mem->va);
  37 -       mem->va = NULL;
  38         return 0;
  39  }
  40