This is a note to let you know that I've just added the patch titled
USB: usb_wwan: fix handling of missing bulk endpoints
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From bd73bd8831696f189a479a0712ae95208e513d7e Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Thu, 3 Apr 2014 13:06:46 +0200
Subject: USB: usb_wwan: fix handling of missing bulk endpoints
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fix regression introduced by commit 8e493ca1767d ("USB: usb_wwan: fix
bulk-urb allocation") by making sure to require both bulk-in and out
endpoints during port probe.
The original option driver (which usb_wwan is based on) was written
under the assumption that either endpoint could be missing, but
evidently this cannot have been tested properly. Specifically, it would
handle opening a device without bulk-in (but would blow up during resume
which was implemented later), but not a missing bulk-out in write()
(although it is handled in some places such as write_room()).
Fortunately (?), the driver also got the test for missing endpoints
wrong so the urbs were in fact always allocated, although they would be
initialised using the wrong endpoint address (0) and any submission of
such an urb would fail.
The commit mentioned above fixed the test for missing endpoints but
thereby exposed the other bugs which would now generate null-pointer
exceptions rather than failed urb submissions.
The regression was introduced in v3.7, but the offending commit was also
marked for stable.
Reported-by: Rafał Miłecki <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Tested-by: Rafał Miłecki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/serial/usb_wwan.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 640fe0173236..b078440e822f 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -466,6 +466,9 @@ int usb_wwan_port_probe(struct usb_serial_port *port)
int err;
int i;
+ if (!port->bulk_in_size || !port->bulk_out_size)
+ return -ENODEV;
+
portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
if (!portdata)
return -ENOMEM;
@@ -473,9 +476,6 @@ int usb_wwan_port_probe(struct usb_serial_port *port)
init_usb_anchor(&portdata->delayed);
for (i = 0; i < N_IN_URB; i++) {
- if (!port->bulk_in_size)
- break;
-
buffer = (u8 *)__get_free_page(GFP_KERNEL);
if (!buffer)
goto bail_out_error;
@@ -489,9 +489,6 @@ int usb_wwan_port_probe(struct usb_serial_port *port)
}
for (i = 0; i < N_OUT_URB; i++) {
- if (!port->bulk_out_size)
- break;
-
buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
if (!buffer)
goto bail_out_error2;
--
1.9.0
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