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SubjectKASAN: global-out-of-bounds Read in qmi_wwan_probe
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Hello,

syzbot found the following crash on:

HEAD commit: 9939f56e 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=1615a669a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=df134eda130bb43a
dashboard link: https://syzkaller.appspot.com/bug?extid=b68605d7fadd21510de1
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10630af6a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1127da69a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b68605d7fadd21510de1@syzkaller.appspotmail.com

usb 1-1: new high-speed USB device number 2 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=12d1, idProduct=14f1,
bcdDevice=d4.d9
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
==================================================================
BUG: KASAN: global-out-of-bounds in qmi_wwan_probe+0x342/0x360
drivers/net/usb/qmi_wwan.c:1417
Read of size 8 at addr ffffffff8618c140 by task kworker/1:1/22

CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.2.0-rc5+ #11
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+0x67/0x231 mm/kasan/report.c:188
__kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
kasan_report+0xe/0x20 mm/kasan/common.c:614
qmi_wwan_probe+0x342/0x360 drivers/net/usb/qmi_wwan.c:1417
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x660 drivers/base/dd.c:509
driver_probe_device+0x104/0x210 drivers/base/dd.c:670
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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