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nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame() 

[ Upstream commit 9dab880d67 ]

Fix a use-after-free that occurs in hcd when in_urb sent from
pn533_usb_send_frame() is completed earlier than out_urb. Its callback
frees the skb data in pn533_send_async_complete() that is used as a
transfer buffer of out_urb. Wait before sending in_urb until the
callback of out_urb is called. To modify the callback of out_urb alone,
separate the complete function of out_urb and ack_urb.

Found by a modified version of syzkaller.

BUG: KASAN: use-after-free in dummy_timer
Call Trace:
 memcpy (mm/kasan/shadow.c:65)
 dummy_perform_transfer (drivers/usb/gadget/udc/dummy_hcd.c:1352)
 transfer (drivers/usb/gadget/udc/dummy_hcd.c:1453)
 dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:1972)
 arch_static_branch (arch/x86/include/asm/jump_label.h:27)
 static_key_false (include/linux/jump_label.h:207)
 timer_expire_exit (include/trace/events/timer.h:127)
 call_timer_fn (kernel/time/timer.c:1475)
 expire_timers (kernel/time/timer.c:1519)
 __run_timers (kernel/time/timer.c:1790)
 run_timer_softirq (kernel/time/timer.c:1803)

Fixes: c46ee38620 ("NFC: pn533: add NXP pn533 nfc device driver")
Signed-off-by: Minsuk Kang <linuxlovemin@yonsei.ac.kr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Minsuk Kang 2023-01-06 17:23:44 +09:00 committed by Greg Kroah-Hartman
parent 7bed0d49ca
commit 8998db5021
1 changed files with 41 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/nfc/pn533/usb.c
View File

@ -153,10 +153,17 @@ static int pn533_usb_send_ack(struct pn533 *dev, gfp_t flags)
return usb_submit_urb(phy->ack_urb, flags);
}
struct pn533_out_arg {
struct pn533_usb_phy *phy;
struct completion done;
};
static int pn533_usb_send_frame(struct pn533 *dev,
struct sk_buff *out)
{
struct pn533_usb_phy *phy = dev->phy;
struct pn533_out_arg arg;
void *cntx;
int rc;
if (phy->priv == NULL)
@ -168,10 +175,17 @@ static int pn533_usb_send_frame(struct pn533 *dev,
print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
out->data, out->len, false);
init_completion(&arg.done);
cntx = phy->out_urb->context;
phy->out_urb->context = &arg;
rc = usb_submit_urb(phy->out_urb, GFP_KERNEL);
if (rc)
return rc;
wait_for_completion(&arg.done);
phy->out_urb->context = cntx;
if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
/* request for response for sent packet directly */
rc = pn533_submit_urb_for_response(phy, GFP_KERNEL);
@ -408,7 +422,31 @@ static int pn533_acr122_poweron_rdr(struct pn533_usb_phy *phy)
return arg.rc;
}
static void pn533_send_complete(struct urb *urb)
static void pn533_out_complete(struct urb *urb)
{
struct pn533_out_arg *arg = urb->context;
struct pn533_usb_phy *phy = arg->phy;
switch (urb->status) {
case 0:
break; /* success */
case -ECONNRESET:
case -ENOENT:
dev_dbg(&phy->udev->dev,
"The urb has been stopped (status %d)\n",
urb->status);
break;
case -ESHUTDOWN:
default:
nfc_err(&phy->udev->dev,
"Urb failure (status %d)\n",
urb->status);
}
complete(&arg->done);
}
static void pn533_ack_complete(struct urb *urb)
{
struct pn533_usb_phy *phy = urb->context;
@ -496,10 +534,10 @@ static int pn533_usb_probe(struct usb_interface *interface,
usb_fill_bulk_urb(phy->out_urb, phy->udev,
usb_sndbulkpipe(phy->udev, out_endpoint),
NULL, 0, pn533_send_complete, phy);
NULL, 0, pn533_out_complete, phy);
usb_fill_bulk_urb(phy->ack_urb, phy->udev,
usb_sndbulkpipe(phy->udev, out_endpoint),
NULL, 0, pn533_send_complete, phy);
NULL, 0, pn533_ack_complete, phy);
switch (id->driver_info) {
case PN533_DEVICE_STD: