Re: KASAN: slab-out-of-bounds Read in ath9k_hif_usb_rx_cb (2)

syzbot
2020-10-27T12:33:19Z

syzbot has found a reproducer for the following issue on:

HEAD commit: 3650b228 Linux 5.10-rc1
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=14485e50500000
kernel config: https://syzkaller.appspot.com/x/.config?x=b1c5bd23a80035ea
dashboard link: https://syzkaller.appspot.com/bug?extid=6ecc26112e7241c454ef
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11d8eff7900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15130390500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6ecc26112e7241c454ef@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:399 [inline]
BUG: KASAN: slab-out-of-bounds in ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:562 [inline]
BUG: KASAN: slab-out-of-bounds in ath9k_hif_usb_rx_cb+0x3ab/0x1020 drivers/net/wireless/ath/ath9k/hif_usb.c:680
Read of size 41740 at addr ffff88810bf10000 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385
__kasan_report mm/kasan/report.c:545 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
check_memory_region_inline mm/kasan/generic.c:186 [inline]
check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
memcpy+0x20/0x60 mm/kasan/common.c:105
memcpy include/linux/string.h:399 [inline]
ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:562 [inline]
ath9k_hif_usb_rx_cb+0x3ab/0x1020 drivers/net/wireless/ath/ath9k/hif_usb.c:680
__usb_hcd_giveback_urb+0x32d/0x560 drivers/usb/core/hcd.c:1650
usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1716
dummy_timer+0x11f4/0x3280 drivers/usb/gadget/udc/dummy_hcd.c:1967
call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1415
expire_timers kernel/time/timer.c:1460 [inline]
__run_timers.part.0+0x67c/0xa10 kernel/time/timer.c:1752
__run_timers kernel/time/timer.c:1733 [inline]
run_timer_softirq+0x80/0x120 kernel/time/timer.c:1765
__do_softirq+0x1b2/0x945 kernel/softirq.c:298
asm_call_irq_on_stack+0xf/0x20
</IRQ>
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu kernel/softirq.c:423 [inline]
irq_exit_rcu+0x110/0x1a0 kernel/softirq.c:435
sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:169 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:517
Code: bd 13 a1 fb 84 db 75 ac e8 64 1b a1 fb e8 8f c1 a6 fb e9 0c 00 00 00 e8 55 1b a1 fb 0f 00 2d 1e be 69 00 e8 49 1b a1 fb fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 e4 13 a1 fb 48 85 db
RSP: 0018:ffffffff87007d60 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff1079e01
RDX: ffffffff87031000 RSI: ffffffff859daf27 RDI: ffffffff859daf11
RBP: ffff888103980864 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff888103980800 R14: ffff888103980864 R15: ffff88810545e804
acpi_idle_enter+0x355/0x4f0 drivers/acpi/processor_idle.c:648
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:132 [inline]
cpuidle_idle_call kernel/sched/idle.c:213 [inline]
do_idle+0x3d5/0x580 kernel/sched/idle.c:273
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:369
start_kernel+0x472/0x493 init/main.c:1051
secondary_startup_64_no_verify+0xa6/0xab

The buggy address belongs to the page:
page:00000000dfda5045 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10bf10
head:00000000dfda5045 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x200000000010000(head)
raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff88810bf18380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88810bf18400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88810bf18480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
^
ffff88810bf18500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 00
ffff88810bf18580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================