i2c: Sanity checks on adapter registration

Make sure I2C adapters being registered have the required struct
fields set. If they don't, problems will happen later.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d231f683f576..6b4cc567645b 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -848,6 +848,18 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
                 goto out_list;
         }
 
+        /* Sanity checks */
+        if (unlikely(adap->name[0] == '\0')) {
+                pr_err("i2c-core: Attempt to register an adapter with "
+                       "no name!\n");
+                return -EINVAL;
+        }
+        if (unlikely(!adap->algo)) {
+                pr_err("i2c-core: Attempt to register adapter '%s' with "
+                       "no algo!\n", adap->name);
+                return -EINVAL;
+        }
+
         rt_mutex_init(&adap->bus_lock);
         mutex_init(&adap->userspace_clients_lock);
         INIT_LIST_HEAD(&adap->userspace_clients);