From: Jesper Juhl <jesper.juhl@gmail.com>
Date: Sat, 8 Mar 2008 01:16:07 +0000 (+0100)
Subject: PCI Hotplug: Fix small mem leak in IBM Hot Plug Controller Driver
X-Git-Tag: v2.6.25-rc6~47^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b91aac29bb9b7cab34b0297449bd2a16944b83d9;p=platform%2Fkernel%2Flinux-stable.git

PCI Hotplug: Fix small mem leak in IBM Hot Plug Controller Driver

In drivers/pci/hotplug/ibmphp_ebda.c::ebda_rsrc_controller(), storage is
allocated with kzalloc() and assigned to 'tmp_slot'.  Then lots of
stuff, like ->flag, ->supported_speed etc is set in tmp_slot.  A bit
further down there's then this test :

  if (!bus_info_ptr1) {
    rc = -ENODEV;
    goto error;
  }

At this point, tmp_slot has not been assigned to anything, so when
erroring-out we want to free it, but nothing at the 'error:' label
free's 'tmp_slot' - and we can't really free 'tmp_slot' at 'error:'
since we may jump to that label later when 'tmp_slot' *has* been used
and we do not want it freed. So, the only sane option left seems to be
to kfree(tmp_slot) just before jumping to the 'error:' label in the one
place where this is what actually makes sense. The following patch does
just that and thus kills off a tiny potential memory leak.


Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
index 600ed7b6..bbccde9 100644
--- a/drivers/pci/hotplug/ibmphp_ebda.c
+++ b/drivers/pci/hotplug/ibmphp_ebda.c
@@ -963,6 +963,7 @@ static int __init ebda_rsrc_controller (void)
 
 			bus_info_ptr1 = ibmphp_find_same_bus_num (hpc_ptr->slots[index].slot_bus_num);
 			if (!bus_info_ptr1) {
+				kfree(tmp_slot);
 				rc = -ENODEV;
 				goto error;
 			}