linux-kernel - [PATCH] drm/amdgpu: Fix NULL pointer dereference

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Date:   Fri,  8 Apr 2022 12:28:02 +0300
From:   Grigory Vasilyev <h0tc0d3@...il.com>
To:     Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Melissa Wen <mwen@...lia.com>
Cc:     Grigory Vasilyev <h0tc0d3@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Michel Dänzer <mdaenzer@...hat.com>,
        Simon Ser <contact@...rsion.fr>, Evan Quan <evan.quan@....com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Sean Paul <seanpaul@...omium.org>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu: Fix NULL pointer dereference

The code below check for NULL, but is no check at this place, which is
potentially dangerous.

Signed-off-by: Grigory Vasilyev <h0tc0d3@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index d26810e7311d..c773a92dd4e5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -1017,8 +1017,10 @@ static int amdgpu_display_get_fb_info(const struct amdgpu_framebuffer *amdgpu_fb
 	int r;
 
 	if (!amdgpu_fb) {
-		*tiling_flags = 0;
-		*tmz_surface = false;
+		if (tiling_flags)
+			*tiling_flags = 0;
+		if (tmz_surface)
+			*tmz_surface = false;
 		return 0;
 	}
 
-- 
2.35.1