linux-kernel - [PATCH AUTOSEL 6.13 3/8] firmware: qcom: scm: smc: Handle missing SCM device

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Message-Id: <20250126164523.963930-3-sashal@kernel.org>
Date: Sun, 26 Jan 2025 11:45:18 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	konradybcio@...nel.org,
	linux-arm-msm@...r.kernel.org
Subject: [PATCH AUTOSEL 6.13 3/8] firmware: qcom: scm: smc: Handle missing SCM device

From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

[ Upstream commit 94f48ecf0a538019ca2025e0b0da391f8e7cc58c ]

Commit ca61d6836e6f ("firmware: qcom: scm: fix a NULL-pointer
dereference") makes it explicit that qcom_scm_get_tzmem_pool() can
return NULL, therefore its users should handle this.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Link: https://lore.kernel.org/r/20241209-qcom-scm-missing-barriers-and-all-sort-of-srap-v2-5-9061013c8d92@linaro.org
Signed-off-by: Bjorn Andersson <andersson@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/qcom/qcom_scm-smc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/qcom/qcom_scm-smc.c b/drivers/firmware/qcom/qcom_scm-smc.c
index 2b4c2826f5725..3f10b23ec941b 100644
--- a/drivers/firmware/qcom/qcom_scm-smc.c
+++ b/drivers/firmware/qcom/qcom_scm-smc.c
@@ -173,6 +173,9 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc,
 		smc.args[i + SCM_SMC_FIRST_REG_IDX] = desc->args[i];
 
 	if (unlikely(arglen > SCM_SMC_N_REG_ARGS)) {
+		if (!mempool)
+			return -EINVAL;
+
 		args_virt = qcom_tzmem_alloc(mempool,
 					     SCM_SMC_N_EXT_ARGS * sizeof(u64),
 					     flag);
-- 
2.39.5