USB: serial: digi_acceleport: Eliminate a NULL pointer dereference
Author: Julia Lawall <julia@diku.dk>
If port is NULL, then the call to dev_err will dereference a value that is
a small offset from NULL.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
//
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@
if ((E == NULL && ...) || ...)
{
... when != if (...) S1 else S2
when != E = E1
* E->f
... when any
return ...;
}
else S3
//
Signed-off-by: Julia Lawall
Signed-off-by: Greg Kroah-Hartman
---
drivers/usb/serial/digi_acceleport.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 3edda3e..fd35f73 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1239,8 +1239,7 @@ static void digi_write_bulk_callback(struct urb *urb)
/* port and serial sanity check */
if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
- dev_err(&port->dev,
- "%s: port or port->private is NULL, status=%d\n",
+ pr_err("%s: port or port->private is NULL, status=%d\n",
__func__, status);
return;
} |
---
drivers/usb/serial/digi_acceleport.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 3edda3e..fd35f73 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1239,8 +1239,7 @@ static void digi_write_bulk_callback(struct urb *urb)
/* port and serial sanity check */
if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
- dev_err(&port->dev,
- "%s: port or port->private is NULL, status=%d\n",
+ pr_err("%s: port or port->private is NULL, status=%d\n",
__func__, status);
return;
}