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drm/mm: avoid possible null pointer dereference
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
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1 changed files with 3 additions and 1 deletions
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@ -179,12 +179,14 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
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int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
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{
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struct drm_mm_node *hole;
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u64 end = node->start + node->size;
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u64 end;
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u64 hole_start;
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u64 hole_end;
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BUG_ON(node == NULL);
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end = node->start + node->size;
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/* Find the relevant hole to add our node to */
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drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
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if (hole_start > node->start || hole_end < end)
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