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Date:   Sat, 21 Mar 2020 06:40:16 -0700
Message-ID: <000000000000ca19c205a15d8aca@google.com>
Subject: KASAN: slab-out-of-bounds Read in garmin_read_process
From:   syzbot <syzbot+d29e9263e13ce0b9f4fd@syzkaller.appspotmail.com>
To:     andreyknvl@google.com, gregkh@linuxfoundation.org,
        johan@kernel.org, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    e17994d1 usb: core: kcov: collect coverage from usb comple..
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=16255ce5e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
dashboard link: https://syzkaller.appspot.com/bug?extid=d29e9263e13ce0b9f4fd
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1376a3f9e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c65fe3e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d29e9263e13ce0b9f4fd@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in __le32_to_cpup include/uapi/linux/byteorder/little_endian.h:58 [inline]
BUG: KASAN: slab-out-of-bounds in getLayerId drivers/usb/serial/garmin_gps.c:208 [inline]
BUG: KASAN: slab-out-of-bounds in garmin_read_process+0x1b0/0x2e0 drivers/usb/serial/garmin_gps.c:1142
Read of size 4 at addr ffff8881ca74abe8 by task swapper/1/0

CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc5-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+0xef/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 __le32_to_cpup include/uapi/linux/byteorder/little_endian.h:58 [inline]
 getLayerId drivers/usb/serial/garmin_gps.c:208 [inline]
 garmin_read_process+0x1b0/0x2e0 drivers/usb/serial/garmin_gps.c:1142
 garmin_read_int_callback+0x19f/0x746 drivers/usb/serial/garmin_gps.c:1279
 __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716
 dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966


---
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