linux-kernel - [PATCH][next] media: venus: hfi,pm,firmware: Fix dereference before null check on hdev

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Message-Id: <20210407141004.495093-1-colin.king@canonical.com>
Date:   Wed,  7 Apr 2021 15:10:04 +0100
From:   Colin King <colin.king@...onical.com>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Dikshita Agarwal <dikshita@...eaurora.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] media: venus: hfi,pm,firmware: Fix dereference before null check on hdev

From: Colin Ian King <colin.king@...onical.com>

The pointer hdev is being dereferenced twice on the assignment of
pointers cpu_cs_base and wrapper_base before hdev is being null
checked.  Fix the potential null pointer dereference issues by
performing the null check of hdev before dereferencing it when
assigning cpu_cs_base and wrapper_base.

Addresses-Coverity: ("Dereference before null check")
Fixes: ff2a7013b3e6 ("media: venus: hfi,pm,firmware: Convert to block relative addressing")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/platform/qcom/venus/hfi_venus.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index cebb20cf371f..3eabb2646572 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -1094,12 +1094,14 @@ static irqreturn_t venus_isr(struct venus_core *core)
 {
 	struct venus_hfi_device *hdev = to_hfi_priv(core);
 	u32 status;
-	void __iomem *cpu_cs_base = hdev->core->cpu_cs_base;
-	void __iomem *wrapper_base = hdev->core->wrapper_base;
+	void __iomem *cpu_cs_base, *wrapper_base;
 
 	if (!hdev)
 		return IRQ_NONE;
 
+	cpu_cs_base = hdev->core->cpu_cs_base;
+	wrapper_base = hdev->core->wrapper_base;
+
 	status = readl(wrapper_base + WRAPPER_INTR_STATUS);
 	if (IS_V6(core)) {
 		if (status & WRAPPER_INTR_STATUS_A2H_MASK ||
-- 
2.30.2