struct pn533_out_arg used as a temporary context for out_urb is not
initialized properly. Its uninitialized 'phy' field can be dereferenced in
error cases inside pn533_out_complete() callback function. It causes the
following failure:

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.2.0-rc3-next-20230110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:pn533_out_complete.cold+0x15/0x44 drivers/nfc/pn533/usb.c:441
Call Trace:
 <IRQ>
 __usb_hcd_giveback_urb+0x2b6/0x5c0 drivers/usb/core/hcd.c:1671
 usb_hcd_giveback_urb+0x384/0x430 drivers/usb/core/hcd.c:1754
 dummy_timer+0x1203/0x32d0 drivers/usb/gadget/udc/dummy_hcd.c:1988
 call_timer_fn+0x1da/0x800 kernel/time/timer.c:1700
 expire_timers+0x234/0x330 kernel/time/timer.c:1751
 __run_timers kernel/time/timer.c:2022 [inline]
 __run_timers kernel/time/timer.c:1995 [inline]
 run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
 __do_softirq+0x1fb/0xaf6 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1107

Initialize the field with the pn533_usb_phy currently used.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Fixes: 9dab880d675b ("nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame()")
Reported-by: syzbot+1e608ba4217c96d1952f@syzkaller.appspotmail.com
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
---
v2: follow reverse xmas tree ordering as suggested by Simon Horman;
some tiny commit info updates

 drivers/nfc/pn533/usb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nfc/pn533/usb.c b/drivers/nfc/pn533/usb.c
index ed9c5e2cf3ad..a187f0e0b0f7 100644
--- a/drivers/nfc/pn533/usb.c
+++ b/drivers/nfc/pn533/usb.c
@@ -175,6 +175,7 @@ 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);
 
+	arg.phy = phy;
 	init_completion(&arg.done);
 	cntx = phy->out_urb->context;
 	phy->out_urb->context = &arg;
-- 
2.34.1

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu,  9 Mar 2023 19:50:50 +0300 you wrote:
> struct pn533_out_arg used as a temporary context for out_urb is not
> initialized properly. Its uninitialized 'phy' field can be dereferenced in
> error cases inside pn533_out_complete() callback function. It causes the
> following failure:
> 
> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.2.0-rc3-next-20230110-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> RIP: 0010:pn533_out_complete.cold+0x15/0x44 drivers/nfc/pn533/usb.c:441
> Call Trace:
>  <IRQ>
>  __usb_hcd_giveback_urb+0x2b6/0x5c0 drivers/usb/core/hcd.c:1671
>  usb_hcd_giveback_urb+0x384/0x430 drivers/usb/core/hcd.c:1754
>  dummy_timer+0x1203/0x32d0 drivers/usb/gadget/udc/dummy_hcd.c:1988
>  call_timer_fn+0x1da/0x800 kernel/time/timer.c:1700
>  expire_timers+0x234/0x330 kernel/time/timer.c:1751
>  __run_timers kernel/time/timer.c:2022 [inline]
>  __run_timers kernel/time/timer.c:1995 [inline]
>  run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
>  __do_softirq+0x1fb/0xaf6 kernel/softirq.c:571
>  invoke_softirq kernel/softirq.c:445 [inline]
>  __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
>  irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
>  sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1107
> 
> [...]

Here is the summary with links:
  - [v2] nfc: pn533: initialize struct pn533_out_arg properly
    https://git.kernel.org/netdev/net/c/484b7059796e

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On Thu, Mar 09, 2023 at 07:50:50PM +0300, Fedor Pchelkin wrote:
> struct pn533_out_arg used as a temporary context for out_urb is not
> initialized properly. Its uninitialized 'phy' field can be dereferenced in
> error cases inside pn533_out_complete() callback function. It causes the
> following failure:
> 
> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.2.0-rc3-next-20230110-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> RIP: 0010:pn533_out_complete.cold+0x15/0x44 drivers/nfc/pn533/usb.c:441
> Call Trace:
>  <IRQ>
>  __usb_hcd_giveback_urb+0x2b6/0x5c0 drivers/usb/core/hcd.c:1671
>  usb_hcd_giveback_urb+0x384/0x430 drivers/usb/core/hcd.c:1754
>  dummy_timer+0x1203/0x32d0 drivers/usb/gadget/udc/dummy_hcd.c:1988
>  call_timer_fn+0x1da/0x800 kernel/time/timer.c:1700
>  expire_timers+0x234/0x330 kernel/time/timer.c:1751
>  __run_timers kernel/time/timer.c:2022 [inline]
>  __run_timers kernel/time/timer.c:1995 [inline]
>  run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035
>  __do_softirq+0x1fb/0xaf6 kernel/softirq.c:571
>  invoke_softirq kernel/softirq.c:445 [inline]
>  __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
>  irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
>  sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1107
> 
> Initialize the field with the pn533_usb_phy currently used.
> 
> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
> 
> Fixes: 9dab880d675b ("nfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame()")
> Reported-by: syzbot+1e608ba4217c96d1952f@syzkaller.appspotmail.com
> Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>

Reviewed-by: Simon Horman <simon.horman@corigine.com>