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UPSTREAM: drm/mm: avoid possible null pointer dereference

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Do not dereference node before the check if node is NULL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1463602639-4861-1-git-send-email-xypron.glpk@gmx.de
(cherry picked from commit b80d394232)

Change-Id: I672ce10214e1268a043e6a11268ff400024cc883
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
This commit is contained in:
Heinrich Schuchardt 2016-05-18 22:17:19 +02:00 committed by Huang, Tao
parent 51239bb223
commit 96cee1532e
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_mm.c
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@ -179,12 +179,14 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
{
struct drm_mm_node *hole;
u64 end = node->start + node->size;
u64 end;
u64 hole_start;
u64 hole_end;
BUG_ON(node == NULL);
end = node->start + node->size;
/* Find the relevant hole to add our node to */
drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
if (hole_start > node->start || hole_end < end)