linux-kernel - [PATCH] drm/i915: Check input parameter for NULL

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Message-Id: <1645455221-38580-1-git-send-email-lyz_cs@pku.edu.cn>
Date:   Mon, 21 Feb 2022 06:53:41 -0800
From:   Yongzhi Liu <lyz_cs@....edu.cn>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...ux.ie, daniel@...ll.ch,
        thomas.hellstrom@...ux.intel.com,
        maarten.lankhorst@...ux.intel.com, matthew.auld@...el.com,
        matthew.d.roper@...el.com, lyz_cs@....edu.cn, tzimmermann@...e.de,
        michal.winiarski@...el.com
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/i915: Check input parameter for NULL

[why]
i915_gem_object_put_pages_phys() frees pages and standard
pattern is to allow caller to not care if it's
NULL or not. This will reduce burden on
the callers to perform this check.

[how]
Fix it by adding Null check.

Signed-off-by: Yongzhi Liu <lyz_cs@....edu.cn>
---
 drivers/gpu/drm/i915/gem/i915_gem_phys.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
index ca6faff..5445f41 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
@@ -95,6 +95,8 @@ void
 i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
 			       struct sg_table *pages)
 {
+	if (!pages)
+		return;
 	dma_addr_t dma = sg_dma_address(pages->sgl);
 	void *vaddr = sg_page(pages->sgl);
 
-- 
2.7.4