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SubjectKASAN: slab-out-of-bounds Read in ath9k_hif_usb_rx_cb (2)
From
Hello,

syzbot found the following issue on:

HEAD commit: ab4dc051 usb: mtu3: simplify mtu3_req_complete()
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=11c0666c900000
kernel config: https://syzkaller.appspot.com/x/.config?x=fb6677a3d4f11788
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=171e6004900000

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 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:627 [inline]
BUG: KASAN: slab-out-of-bounds in ath9k_hif_usb_rx_cb+0xd7d/0xf80 drivers/net/wireless/ath/ath9k/hif_usb.c:671
Read of size 4 at addr ffff8881cbf6c090 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc7-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+0xf6/0x16e lib/dump_stack.c:118
print_address_description.constprop.0+0x1a/0x210 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x37/0x7c mm/kasan/report.c:530
ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:627 [inline]
ath9k_hif_usb_rx_cb+0xd7d/0xf80 drivers/net/wireless/ath/ath9k/hif_usb.c:671
__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+0x11f2/0x3240 drivers/usb/gadget/udc/dummy_hcd.c:1967
call_timer_fn+0x1ac/0x6e0 kernel/time/timer.c:1415
expire_timers kernel/time/timer.c:1460 [inline]
__run_timers.part.0+0x54c/0x9e0 kernel/time/timer.c:1784
__run_timers kernel/time/timer.c:1756 [inline]
run_timer_softirq+0x80/0x120 kernel/time/timer.c:1797
__do_softirq+0x222/0x95b kernel/softirq.c:292
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
</IRQ>
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0xed/0x140 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:387 [inline]
__irq_exit_rcu kernel/softirq.c:417 [inline]
irq_exit_rcu+0x150/0x1f0 kernel/softirq.c:429
sysvec_apic_timer_interrupt+0x49/0xc0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:acpi_safe_halt+0x72/0x90 drivers/acpi/processor_idle.c:112
Code: 74 06 5b e9 e0 4c 8f fb e8 db 4c 8f fb e8 26 d8 94 fb e9 0c 00 00 00 e8 cc 4c 8f fb 0f 00 2d 05 63 74 00 e8 c0 4c 8f fb fb f4 <fa> e8 18 d2 94 fb 5b e9 b2 4c 8f fb 48 89 df e8 fa fb b8 fb eb ab
RSP: 0018:ffffffff87207c80 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8722f840 RSI: ffffffff85b05d40 RDI: ffffffff85b05d2a
RBP: ffff8881d8cca864 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8881d8cca864
R13: 1ffffffff0e40f99 R14: ffff8881d8cca865 R15: 0000000000000001
acpi_idle_do_entry+0x15c/0x1b0 drivers/acpi/processor_idle.c:525
acpi_idle_enter+0x3f0/0xa50 drivers/acpi/processor_idle.c:651
cpuidle_enter_state+0xff/0x870 drivers/cpuidle/cpuidle.c:235
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:346
call_cpuidle kernel/sched/idle.c:126 [inline]
cpuidle_idle_call kernel/sched/idle.c:214 [inline]
do_idle+0x3d6/0x5a0 kernel/sched/idle.c:276
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:372
start_kernel+0xa1b/0xa56 init/main.c:1043
secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:243

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8881cbf6c000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 144 bytes inside of
1024-byte region [ffff8881cbf6c000, ffff8881cbf6c400)
The buggy address belongs to the page:
page:ffffea00072fda00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00072fda00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da002280
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8881cbf6bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881cbf6c000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881cbf6c080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881cbf6c100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881cbf6c180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot can test patches for this issue, for details see:
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