linux-kernel - Re: KASAN: slab-out-of-bounds Read in hfa384x_usbin

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Date:   Tue, 05 May 2020 13:55:48 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     syzbot <syzbot+7d42d68643a35f71ac8a@...kaller.appspotmail.com>,
        andreyknvl@...gle.com, devel@...verdev.osuosl.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, nishkadg.linux@...il.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: slab-out-of-bounds Read in hfa384x_usbin_callback

Am Freitag, den 20.03.2020, 12:28 -0700 schrieb syzbot:
> 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=11d74573e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
> dashboard link: https://syzkaller.appspot.com/bug?extid=7d42d68643a35f71ac8a
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15fa561de00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15d74573e00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+7d42d68643a35f71ac8a@...kaller.appspotmail.com
> 
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:381 [inline]
> BUG: KASAN: slab-out-of-bounds in skb_put_data include/linux/skbuff.h:2284 [inline]
> BUG: KASAN: slab-out-of-bounds in hfa384x_int_rxmonitor drivers/staging/wlan-ng/hfa384x_usb.c:3412 [inline]
> BUG: KASAN: slab-out-of-bounds in hfa384x_usbin_rx drivers/staging/wlan-ng/hfa384x_usb.c:3312 [inline]
> BUG: KASAN: slab-out-of-bounds in hfa384x_usbin_callback+0x1993/0x2360 drivers/staging/wlan-ng/hfa384x_usb.c:3026
> Read of size 19671 at addr ffff8881d226413c by task swapper/0/0

#syz test: https://github.com/google/kasan.git e17994d1
View attachment "0001-hfa384x_usb-fix-buffer-overflow.patch" of type "text/x-patch" (1613 bytes)