[PATCH AUTOSEL 6.12 3/7] firmware: qcom: scm: smc: Handle missing SCM device

Sasha Levin
2025-01-26T16:45:54Z

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.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@linaro.org>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.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@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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