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authorAlan Stern <stern@rowland.harvard.edu>2009-10-09 12:43:12 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-10-09 13:52:05 -0700
commita4720c650b68a5fe7faed2edeb0ad12645f7ae63 (patch)
tree829c32036a25279bb9aa1fc6077af5fa52f8f29e /drivers/usb
parentba6b702f85a61561d329c4c11d3ed95604924f9a (diff)
USB: serial: don't call release without attach
This patch (as1295) fixes a recently-added bug in the USB serial core. If certain kinds of errors occur during probing, the core may call a serial driver's release method without previously calling the attach method. This causes some drivers (io_ti in particular) to perform an invalid memory access. The patch adds a new flag to keep track of whether or not attach has been called. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Jean-Denis Girard <jd.girard@sysnux.pf> 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/usb-serial.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index aa6b2ae951a..2d0f75d63ff 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -156,7 +156,8 @@ static void destroy_serial(struct kref *kref)
if (serial->minor != SERIAL_TTY_NO_MINOR)
return_serial(serial);
- serial->type->release(serial);
+ if (serial->attached)
+ serial->type->release(serial);
/* Now that nothing is using the ports, they can be freed */
for (i = 0; i < serial->num_port_pointers; ++i) {
@@ -1059,12 +1060,15 @@ int usb_serial_probe(struct usb_interface *interface,
module_put(type->driver.owner);
if (retval < 0)
goto probe_error;
+ serial->attached = 1;
if (retval > 0) {
/* quietly accept this device, but don't bind to a
serial port as it's about to disappear */
serial->num_ports = 0;
goto exit;
}
+ } else {
+ serial->attached = 1;
}
if (get_free_serial(serial, num_ports, &minor) == NULL) {