Staging: ipack: returning a freed pointer

If ipack_device_register() returns an error, then we returned a freed
pointer.  The caller doesn't use it, but it means we return success to
the user instead of returning an error code.

I kind of rewrote the error handling in this function as a cleanup.

Cc: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ipack/bridges/tpci200.c b/drivers/staging/ipack/bridges/tpci200.c
index 6aeb660535ca518f26ea90b69be56515d4c1300e..ab6ea0a5548cb6cb52bcb16722920ba8796d9f28 100644 (file)
--- a/drivers/staging/ipack/bridges/tpci200.c
+++ b/drivers/staging/ipack/bridges/tpci200.c
@@ -372,7 +372,7 @@ static struct ipack_device *tpci200_slot_register(const char *board_name,
                                                  unsigned int slot_position)
 {
        int found = 0;
-       struct ipack_device  *dev = NULL;
+       struct ipack_device  *dev;
        struct tpci200_board *tpci200;
 
        list_for_each_entry(tpci200, &tpci200_list, list) {
@@ -390,16 +390,16 @@ static struct ipack_device *tpci200_slot_register(const char *board_name,
        if (slot_position >= TPCI200_NB_SLOT) {
                pr_info("Slot [%s %d:%d] doesn't exist!\n",
                        TPCI200_SHORTNAME, tpci200_number, slot_position);
-               goto out;
+               return NULL;
        }
 
        if (mutex_lock_interruptible(&tpci200->mutex))
-               goto out;
+               return NULL;
 
        if (tpci200->slots[slot_position].dev != NULL) {
                pr_err("Slot [%s %d:%d] already installed !\n",
                       TPCI200_SHORTNAME, tpci200_number, slot_position);
-               goto out_unlock;
+               goto err_unlock;
        }
 
        dev = kzalloc(sizeof(struct ipack_device), GFP_KERNEL);
@@ -407,7 +407,7 @@ static struct ipack_device *tpci200_slot_register(const char *board_name,
                pr_info("Slot [%s %d:%d] Unable to allocate memory for new slot !\n",
                        TPCI200_SHORTNAME,
                        tpci200_number, slot_position);
-               goto out_unlock;
+               goto err_unlock;
        }
 
        if (size > IPACK_BOARD_NAME_SIZE) {
@@ -440,15 +440,18 @@ static struct ipack_device *tpci200_slot_register(const char *board_name,
        dev->ops = &tpci200_bus_ops;
        tpci200->slots[slot_position].dev = dev;
 
-       if (ipack_device_register(dev) < 0) {
-               tpci200_slot_unregister(dev);
-               kfree(dev);
-       }
+       if (ipack_device_register(dev) < 0)
+               goto err_unregister;
 
-out_unlock:
        mutex_unlock(&tpci200->mutex);
-out:
        return dev;
+
+err_unregister:
+       tpci200_slot_unregister(dev);
+       kfree(dev);
+err_unlock:
+       mutex_unlock(&tpci200->mutex);
+       return NULL;
 }
 
 static ssize_t tpci200_store_board(struct device *pdev, const char *buf,