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Subject[patch 08/88] bas_gigaset: correctly allocate USB interrupt transfer buffer
2.6.28-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Tilman Schmidt <tilman@imap.cc>

[ Upstream commit 170ebf85160dd128e1c4206cc197cce7d1424705 ]

Every USB transfer buffer has to be allocated individually by kmalloc.

Impact: bugfix, no functional change

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Tested-by: Kolja Waschk <kawk@users.sourceforge.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/isdn/gigaset/bas-gigaset.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/drivers/isdn/gigaset/bas-gigaset.c
+++ b/drivers/isdn/gigaset/bas-gigaset.c
@@ -46,6 +46,9 @@ MODULE_PARM_DESC(cidmode, "Call-ID mode"
/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
#define IF_WRITEBUF 264

+/* interrupt pipe message size according to ibid. ch. 2.2 */
+#define IP_MSGSIZE 3
+
/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID 0x0681
#define USB_3070_PRODUCT_ID 0x0001
@@ -110,7 +113,7 @@ struct bas_cardstate {
unsigned char *rcvbuf; /* AT reply receive buffer */

struct urb *urb_int_in; /* URB for interrupt pipe */
- unsigned char int_in_buf[3];
+ unsigned char *int_in_buf;

spinlock_t lock; /* locks all following */
int basstate; /* bitmap (BS_*) */
@@ -657,7 +660,7 @@ static void read_int_callback(struct urb
}

/* drop incomplete packets even if the missing bytes wouldn't matter */
- if (unlikely(urb->actual_length < 3)) {
+ if (unlikely(urb->actual_length < IP_MSGSIZE)) {
dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
urb->actual_length);
goto resubmit;
@@ -2127,6 +2130,7 @@ static void gigaset_reinitbcshw(struct b
static void gigaset_freecshw(struct cardstate *cs)
{
/* timers, URBs and rcvbuf are disposed of in disconnect */
+ kfree(cs->hw.bas->int_in_buf);
kfree(cs->hw.bas);
cs->hw.bas = NULL;
}
@@ -2232,6 +2236,12 @@ static int gigaset_probe(struct usb_inte
}
hostif = interface->cur_altsetting;
}
+ ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
+ if (!ucs->int_in_buf) {
+ kfree(ucs);
+ pr_err("out of memory\n");
+ return 0;
+ }

/* Reject application specific interfaces
*/
@@ -2290,7 +2300,7 @@ static int gigaset_probe(struct usb_inte
usb_fill_int_urb(ucs->urb_int_in, udev,
usb_rcvintpipe(udev,
(endpoint->bEndpointAddress) & 0x0f),
- ucs->int_in_buf, 3, read_int_callback, cs,
+ ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
endpoint->bInterval);
if ((rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL)) != 0) {
dev_err(cs->dev, "could not submit interrupt URB: %s\n",



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