linux-kernel - [PATCH] gpu: i915: fix a missing check of get_free

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Date:   Fri,  8 Mar 2019 22:24:50 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] gpu: i915: fix a missing check of get_free_page

If the allocation fails, return false to avoid potential
NULL pointer dereference

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/gpu/drm/i915/i915_gpu_error.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 9a65341fec09..ad54fc3551df 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -227,8 +227,11 @@ static bool compress_init(struct compress *c)
 	}
 
 	c->tmp = NULL;
-	if (i915_has_memcpy_from_wc())
+	if (i915_has_memcpy_from_wc()) {
 		c->tmp = (void *)__get_free_page(GFP_ATOMIC | __GFP_NOWARN);
+		if (!c->tmp)
+			return false;
+	}
 
 	return true;
 }
-- 
2.17.1