From 8808981baf96e1b3dea1f08461e4d958aa0dbde1 Mon Sep 17 00:00:00 2001
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Sat, 25 Jul 2020 21:50:53 +0200
Subject: [PATCH] i2c: slave: add sanity check when unregistering
Git-commit: 8808981baf96e1b3dea1f08461e4d958aa0dbde1
Patch-mainline: v5.8
References: git-fixes
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/i2c/i2c-core-slave.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/i2c/i2c-core-slave.c b/drivers/i2c/i2c-core-slave.c
index 549751347e6c..1589179d5eb9 100644
--- a/drivers/i2c/i2c-core-slave.c
+++ b/drivers/i2c/i2c-core-slave.c
@@ -58,6 +58,9 @@ int i2c_slave_unregister(struct i2c_client *client)
{
int ret;
+ if (IS_ERR_OR_NULL(client))
+ return -EINVAL;
+
if (!client->adapter->algo->unreg_slave) {
dev_err(&client->dev, "%s: not supported by adapter\n", __func__);
return -EOPNOTSUPP;
--
2.16.4