linux-kernel - [PATCH AUTOSEL 4.14 071/115] remoteproc: Check for NULL firmwares in sysfs interface

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Date:   Tue, 12 Nov 2019 20:55:38 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Suman Anna <s-anna@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-remoteproc@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 071/115] remoteproc: Check for NULL firmwares in sysfs interface

From: Suman Anna <s-anna@...com>

[ Upstream commit faeadbb64094757150a8c2a3175ca418dbdd472c ]

The remoteproc framework provides a sysfs file 'firmware'
for modifying the firmware image name from userspace. Add
an additional check to ensure NULL firmwares are errored
out right away, rather than getting a delayed error while
requesting a firmware during the start of a remoteproc
later on.

Tested-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
Signed-off-by: Suman Anna <s-anna@...com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/remoteproc/remoteproc_sysfs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index 47be411400e56..3a4c3d7cafca3 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -48,6 +48,11 @@ static ssize_t firmware_store(struct device *dev,
 	}
 
 	len = strcspn(buf, "\n");
+	if (!len) {
+		dev_err(dev, "can't provide a NULL firmware\n");
+		err = -EINVAL;
+		goto out;
+	}
 
 	p = kstrndup(buf, len, GFP_KERNEL);
 	if (!p) {
-- 
2.20.1