linux-kernel - [PATCH 4.4 072/113] drm/i915: fix aliasing

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Date:   Mon,  5 Sep 2016 18:44:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matthew Auld <matthew.auld@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH 4.4 072/113] drm/i915: fix aliasing_ppgtt leak

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matthew Auld <matthew.auld@...el.com>

commit 3871f42a57efcdc6a9da751a8cb6fa196c212289 upstream.

In i915_ggtt_cleanup_hw we need to remember to free aliasing_ppgtt. This
fixes the following kmemleak message:

unreferenced object 0xffff880213cca000 (size 8192):
  comm "modprobe", pid 1298, jiffies 4294745402 (age 703.930s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff817c808e>] kmemleak_alloc+0x4e/0xb0
    [<ffffffff8121f9c2>] kmem_cache_alloc_trace+0x142/0x1d0
    [<ffffffffa06d11ef>] i915_gem_init_ggtt+0x10f/0x210 [i915]
    [<ffffffffa06d71bb>] i915_gem_init+0x5b/0xd0 [i915]
    [<ffffffffa069749a>] i915_driver_load+0x97a/0x1460 [i915]
    [<ffffffffa06a26ef>] i915_pci_probe+0x4f/0x70 [i915]
    [<ffffffff81423015>] local_pci_probe+0x45/0xa0
    [<ffffffff81424463>] pci_device_probe+0x103/0x150
    [<ffffffff81515e6c>] driver_probe_device+0x22c/0x440
    [<ffffffff81516151>] __driver_attach+0xd1/0xf0
    [<ffffffff8151379c>] bus_for_each_dev+0x6c/0xc0
    [<ffffffff8151555e>] driver_attach+0x1e/0x20
    [<ffffffff81514fa3>] bus_add_driver+0x1c3/0x280
    [<ffffffff81516aa0>] driver_register+0x60/0xe0
    [<ffffffff8142297c>] __pci_register_driver+0x4c/0x50
    [<ffffffffa013605b>] 0xffffffffa013605b

Signed-off-by: Matthew Auld <matthew.auld@...el.com>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Fixes: b18b6bde300e ("drm/i915/bdw: Free PPGTT struct")
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1470420280-21417-1-git-send-email-matthew.auld@intel.com
(cherry picked from commit cb7f27601c81a1e0454e9461e96f65b31fafbea0)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_gem_gtt.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2747,6 +2747,7 @@ void i915_global_gtt_cleanup(struct drm_
 		struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
 
 		ppgtt->base.cleanup(&ppgtt->base);
+		kfree(ppgtt);
 	}
 
 	if (drm_mm_initialized(&vm->mm)) {