Hello,
syzbot found the following crash on:
HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=14045831600000
kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c1e62d600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166a3a95600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+403741a091bf41d4ae79@xxxxxxxxxxxxxxxxxxxxxxxxx
usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
different from the interface descriptor's value: 9
usb 1-1: New USB device found, idVendor=0e8f, idProduct=0012, bcdDevice=
0.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
greenasia 0003:0E8F:0012.0001: unknown main item tag 0x0
greenasia 0003:0E8F:0012.0001: hidraw0: USB HID v0.00 Device [HID
0e8f:0012] on usb-dummy_hcd.0-1/input0
==================================================================
BUG: KASAN: slab-out-of-bounds in set_bit
include/asm-generic/bitops-instrumented.h:28 [inline]
BUG: KASAN: slab-out-of-bounds in gaff_init drivers/hid/hid-gaff.c:97
[inline]
BUG: KASAN: slab-out-of-bounds in ga_probe+0x1fd/0x6f0
drivers/hid/hid-gaff.c:146
Write of size 8 at addr ffff8881d9acafc0 by task kworker/1:1/78
CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
print_address_description+0x6a/0x32c mm/kasan/report.c:351
__kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
kasan_report+0xe/0x12 mm/kasan/common.c:618
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x128/0x190 mm/kasan/generic.c:192
set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
gaff_init drivers/hid/hid-gaff.c:97 [inline]
ga_probe+0x1fd/0x6f0 drivers/hid/hid-gaff.c:146
hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
__device_attach_driver+0x
---
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