From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: sohu0106 <sohu0106@126.com>
Cc: schwidefsky@de.ibm.com, linux-s390@vger.kernel.org,
torvalds@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: Re: drivers/s390/char/keyboard.c NULL pointer reference
Date: Sat, 5 Aug 2017 09:50:36 +0200 [thread overview]
Message-ID: <20170805075036.GA3376@osiris> (raw)
In-Reply-To: <5ad3af06.c08.15db010eb92.Coremail.sohu0106@126.com>
On Sat, Aug 05, 2017 at 09:44:45AM +0800, sohu0106 wrote:
>
>
> I don't understand a bit,My idea is
>
> in userland
>
> fd=open("tty3270",O_RDONLY)
> ...
> ret=ioctl(fd,KDGKBDIACR,NULL)
> ...
>
> then here
> drivers/s390/char/keyboard.c
> 477
> case KDGKBDIACR:
> {
> struct kbdiacrs __user *a = argp;
> struct kbdiacr diacr;
> int i;
>
> //a is NULL,a->kb_cnt will crash
> if (put_user(kbd->accent_table_size, &a->kb_cnt))
a->kb_cnt and &a->kb_cnt is not the same...
prev parent reply other threads:[~2017-08-05 7:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-03 13:57 drivers/s390/char/keyboard.c NULL pointer reference sohu0106
2017-08-04 9:26 ` Heiko Carstens
2017-08-05 1:44 ` sohu0106
2017-08-05 7:50 ` Heiko Carstens [this message]
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