linux-kernel - [PATCH] firmware: arm_scmi: check return value of idr

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Date:   Fri,  8 Mar 2019 22:02:39 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] firmware: arm_scmi: check return value of idr_find

idr_find may return NULL, so check its return value and return an
error code.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/firmware/arm_scmi/driver.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 8f952f2f1a29..35faa203d549 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -709,6 +709,8 @@ scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev, int prot_id)
 
 	if (scmi_mailbox_check(np)) {
 		cinfo = idr_find(&info->tx_idr, SCMI_PROTOCOL_BASE);
+		if (!cinfo)
+			return -EINVAL;
 		goto idr_alloc;
 	}
 
-- 
2.17.1