Re: Re: drivers/s390/char/keyboard.c NULL pointer reference

From	Heiko Carstens <heiko.carstens@de.ibm.com>
Newsgroups	linux.kernel
Subject	Re: Re: drivers/s390/char/keyboard.c NULL pointer reference
Date	2017-08-05 10:00 +0200
Message-ID	<ub2a5-1U0-3@gated-at.bofh.it> (permalink)
References	<uaoPn-Jx-7@gated-at.bofh.it> <uaH5E-5ax-21@gated-at.bofh.it> <uaWo1-6wz-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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...

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drivers/s390/char/keyboard.c NULL pointer reference sohu0106 <sohu0106@126.com> - 2017-08-03 16:00 +0200
  Re: drivers/s390/char/keyboard.c NULL pointer reference Heiko Carstens <heiko.carstens@de.ibm.com> - 2017-08-04 11:30 +0200
    Re:Re: drivers/s390/char/keyboard.c NULL pointer reference sohu0106 <sohu0106@126.com> - 2017-08-05 03:50 +0200
      Re: Re: drivers/s390/char/keyboard.c NULL pointer reference Heiko Carstens <heiko.carstens@de.ibm.com> - 2017-08-05 10:00 +0200

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