diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2009-10-09 12:43:12 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-22 15:11:49 -0700 |
| commit | dd02f3999f68aadaf7b3e61586fda3f5caac3ead (patch) | |
| tree | e975a59fad89b9a61968fd8eb8163a2b5d1c86e2 | |
| parent | f33206c1e3c1a34ba76d9a009a0bdde63ef9248d (diff) | |
USB: serial: don't call release without attach
commit a4720c650b68a5fe7faed2edeb0ad12645f7ae63 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 6 | ||||
| -rw-r--r-- | include/linux/usb/serial.h | 1 |
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index a0702db4e9a7..3292e0391e28 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -155,7 +155,8 @@ 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) { @@ -1060,12 +1061,15 @@ 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) { diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index 73f121ef4de0..20b12f3207ae 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -148,6 +148,7 @@ struct usb_serial { struct usb_interface *interface; unsigned char disconnected:1; unsigned char suspending:1; + unsigned char attached:1; unsigned char minor; unsigned char num_ports; unsigned char num_port_pointers; |