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authorAndré Goddard Rosa <andre.goddard@gmail.com>2009-10-25 11:16:32 -0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 15:18:04 -0800
commit9e845abfc8a8973373821aa05302794fd254514b (patch)
tree0dbd44e16a4fbe9554d25b4dcbc17fea7207a933 /drivers/serial/serial_core.c
parent2a0785ea375fe93cd480599bb40d0c837ff72a2e (diff)
downloadlinux-9e845abfc8a8973373821aa05302794fd254514b.tar.bz2
serial: fix NULL pointer dereference
If kzalloc() or alloc_tty_driver() fails, we call: put_tty_driver(normal = NULL). Then: put_tty_driver -> tty_driver_kref_put -> kref_put(&NULL->kref, ...) Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/serial/serial_core.c')
-rw-r--r--drivers/serial/serial_core.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index dcc72444e8e7..885eabe552cd 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -2344,7 +2344,7 @@ static const struct tty_operations uart_ops = {
*/
int uart_register_driver(struct uart_driver *drv)
{
- struct tty_driver *normal = NULL;
+ struct tty_driver *normal;
int i, retval;
BUG_ON(drv->state);
@@ -2354,13 +2354,12 @@ int uart_register_driver(struct uart_driver *drv)
* we have a large number of ports to handle.
*/
drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL);
- retval = -ENOMEM;
if (!drv->state)
goto out;
- normal = alloc_tty_driver(drv->nr);
+ normal = alloc_tty_driver(drv->nr);
if (!normal)
- goto out;
+ goto out_kfree;
drv->tty_driver = normal;
@@ -2393,12 +2392,14 @@ int uart_register_driver(struct uart_driver *drv)
}
retval = tty_register_driver(normal);
- out:
- if (retval < 0) {
- put_tty_driver(normal);
- kfree(drv->state);
- }
- return retval;
+ if (retval >= 0)
+ return retval;
+
+ put_tty_driver(normal);
+out_kfree:
+ kfree(drv->state);
+out:
+ return -ENOMEM;
}
/**