linux-kernel - [PATCH v2 1/2] firmware: qcom: scm: fix a NULL-pointer dereference

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Message-Id: <20240911-tzmem-null-ptr-v2-1-7c61b1a1b463@linaro.org>
Date: Wed, 11 Sep 2024 11:07:03 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Andrew Halaney <ahalaney@...hat.com>, 
 Elliot Berman <quic_eberman@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Rudraksha Gupta <guptarud@...il.com>, 
 "Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v2 1/2] firmware: qcom: scm: fix a NULL-pointer dereference

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Some SCM calls can be invoked with __scm being NULL (the driver may not
have been and will not be probed as there's no SCM entry in device-tree).
Make sure we don't dereference a NULL pointer.

Fixes: 449d0d84bcd8 ("firmware: qcom: scm: smc: switch to using the SCM allocator")
Reported-by: Rudraksha Gupta <guptarud@...il.com>
Closes: https://lore.kernel.org/lkml/692cfe9a-8c05-4ce4-813e-82b3f310019a@gmail.com/
Reviewed-by: Konrad Dybcio <konradybcio@...nel.org>
Tested-by: Rudraksha Gupta <guptarud@...il.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/firmware/qcom/qcom_scm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 10986cb11ec0..8bac4915c211 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -216,7 +216,7 @@ static DEFINE_SPINLOCK(scm_query_lock);
 
 struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void)
 {
-	return __scm->mempool;
+	return __scm ? __scm->mempool : NULL;
 }
 
 static enum qcom_scm_convention __get_convention(void)

-- 
2.43.0