linux-kernel - [PATCH] drm/msm/dpu: Fix pointer dereferenced before checking

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Date:   Mon, 30 May 2022 10:19:55 +0800
From:   Haowen Bai <baihaowen@...zu.com>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     Haowen Bai <baihaowen@...zu.com>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/msm/dpu: Fix pointer dereferenced before checking

The phys_enc->wb_idx is dereferencing before null checking, so move
it after checking.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
index 4829d1ce0cf8..59da348ff339 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
@@ -574,11 +574,11 @@ static void dpu_encoder_phys_wb_disable(struct dpu_encoder_phys *phys_enc)
  */
 static void dpu_encoder_phys_wb_destroy(struct dpu_encoder_phys *phys_enc)
 {
-	DPU_DEBUG("[wb:%d]\n", phys_enc->wb_idx - WB_0);
-
 	if (!phys_enc)
 		return;
 
+	DPU_DEBUG("[wb:%d]\n", phys_enc->wb_idx - WB_0);
+
 	kfree(phys_enc);
 }
 
-- 
2.7.4