[PATCH 5.4 37/67] i2c: slave: add sanity check when unregistering

[Greg Kroah-Hartman]

From: Wolfram Sang <wsa+rene...@sang-engineering.com>

[ Upstream commit 8808981baf96e1b3dea1f08461e4d958aa0dbde1 ]

Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
Reviewed-by: Alain Volmat <alain.vol...@st.com>
Signed-off-by: Wolfram Sang <w...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 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 549751347e6c7..1589179d5eb92 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;
-- 
2.25.1