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authorElina Pasheva <epasheva@sierrawireless.com>2010-02-15 14:50:14 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-02 14:55:03 -0800
commitb87c6e86dac1bb5222279cc8ff7e09529e1c4ed9 (patch)
tree01c52edb21677004ad1a64c20f1f3f965ee13b27 /drivers/usb
parent7650cd9678df29b01d1e46a9d2ce7e5d8c72b3ce (diff)
USB: serial: sierra driver indat_callback fix
A crash has been reported with sierra driver on disconnect with Ubuntu/Lucid distribution based on kernel-2.6.32. The cause of the crash was determined as "NULL tty pointer was being referenced" and the NULL pointer was passed by sierra_indat_callback(). This patch modifies sierra_indat_callback() function to check for NULL tty structure pointer. This modification prevents a crash from happening when the device is disconnected. This patch fixes the bug reported in Launchpad: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/511157 Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/sierra.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 6aeea40081c..fcec4660355 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -594,14 +594,17 @@ static void sierra_indat_callback(struct urb *urb)
} else {
if (urb->actual_length) {
tty = tty_port_tty_get(&port->port);
-
- tty_buffer_request_room(tty, urb->actual_length);
- tty_insert_flip_string(tty, data, urb->actual_length);
- tty_flip_buffer_push(tty);
-
- tty_kref_put(tty);
- usb_serial_debug_data(debug, &port->dev, __func__,
- urb->actual_length, data);
+ if (tty) {
+ tty_buffer_request_room(tty,
+ urb->actual_length);
+ tty_insert_flip_string(tty, data,
+ urb->actual_length);
+ tty_flip_buffer_push(tty);
+
+ tty_kref_put(tty);
+ usb_serial_debug_data(debug, &port->dev,
+ __func__, urb->actual_length, data);
+ }
} else {
dev_dbg(&port->dev, "%s: empty read urb"
" received\n", __func__);