linux-kernel - [PATCH v6] misc: fastrpc: check qcom_scm_assign_mem() return in rpmsg

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20260128033454.2614886-1-xjdeng@buaa.edu.cn>
Date: Wed, 28 Jan 2026 11:34:54 +0800
From: Xingjing Deng <micro6947@...il.com>
To: srini@...nel.org,
	amahesh@....qualcomm.com,
	arnd@...db.de,
	gregkh@...uxfoundation.org
Cc: dri-devel@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xingjing Deng <xjdeng@...a.edu.cn>,
	stable@...r.kernel.org
Subject: [PATCH v6] misc: fastrpc: check qcom_scm_assign_mem() return in rpmsg_probe

In the SDSP probe path, qcom_scm_assign_mem() is used to assign the
reserved memory to the configured VMIDs, but its return value was not checked.

Fail the probe if the SCM call fails to avoid continuing with an
unexpected/incorrect memory permission configuration.

This issue was detected by a private static analysis tool.
No actual hardware testing was performed as the issue is purely
code-level and verified via static analysis.

Fixes: c3c0363bc72d4 ("misc: fastrpc: support complete DMA pool access to the DSP")
Cc: stable@...r.kernel.org # 6.11-rc1
Signed-off-by: Xingjing Deng <xjdeng@...a.edu.cn>
---
v6:
- Add description of the detection tool.
- Link to v5: https://lore.kernel.org/linux-arm-msm/20260117140351.875511-1-xjdeng@buaa.edu.cn/T/#u

v5:
- Squash the functional change and indentation fix into a single patch.
- Link to v4: https://lore.kernel.org/linux-arm-msm/2026011637-statute-showy-2c3f@gregkh/T/#t

v4:
- Format the indentation
- Link to v3: https://lore.kernel.org/linux-arm-msm/20260113084352.72itrloj5w7qb5o3@hu-mojha-hyd.qualcomm.com/T/#t

v3:
- Add missing linux-kernel@...r.kernel.org to cc list.
- Standarlize changelog placement/format.
- Link to v2: https://lore.kernel.org/linux-arm-msm/20260113063618.e2ke47gy3hnfi67e@hu-mojha-hyd.qualcomm.com/T/#t

v2:
- Add Fixes: and Cc: stable tags.
- Link to v1: https://lore.kernel.org/linux-arm-msm/20260113022550.4029635-1-xjdeng@buaa.edu.cn/T/#u
---
 drivers/misc/fastrpc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index ee652ef01534..8bac2216cb20 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2337,8 +2337,11 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
 		if (!err) {
 			src_perms = BIT(QCOM_SCM_VMID_HLOS);
 
-			qcom_scm_assign_mem(res.start, resource_size(&res), &src_perms,
+			err = qcom_scm_assign_mem(res.start, resource_size(&res), &src_perms,
 				    data->vmperms, data->vmcount);
+			if (err) {
+				goto err_free_data;
+			}
 		}
 
 	}
-- 
2.25.1