commit 8808981baf96e1b3dea1f08461e4d958aa0dbde1
author Wolfram Sang <wsa+renesas@sang-engineering.com> Sat Jul 25 21:50:53 2020 +0200
committer Wolfram Sang <wsa@kernel.org> Tue Jul 28 18:37:17 2020 +0200
tree e4837ed95a192f04ae2c5e46e2508f33cadd9abe
parent 1b1be3bf27b62f5abcf85c6f3214bdb9c7526685

i2c: slave: add sanity check when unregistering

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>

drivers/i2c/i2c-core-slave.c

diff --git a/drivers/i2c/i2c-core-slave.c b/drivers/i2c/i2c-core-slave.c
index 5497513..1589179 100644
--- a/drivers/i2c/i2c-core-slave.c
+++ b/drivers/i2c/i2c-core-slave.c
@@ -58,6 +58,9 @@
 {
 	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;