netdev - RE: [patch] isdnloop: several buffer overflows

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Date:	Tue, 8 Apr 2014 09:34:09 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Dan Carpenter' <dan.carpenter@...cle.com>,
	Karsten Keil <isdn@...ux-pingi.de>
CC:	"David S. Miller" <davem@...emloft.net>,
	YOSHIFUJI Hideaki / ???? <yoshfuji@...ux-ipv6.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [patch] isdnloop: several buffer overflows

From: Dan Carpenter
> There are three buffer overflows addressed in this patch.
...
> 2) In isdnloop_parse_cmd(), p points to a 6 characters into a 60
> character buffer so we have 54 characters.  The ->eazlist[] is 11
> characters long.  I have modified the code to return if the source
> buffer is too long.
...
> @@ -903,6 +903,8 @@ isdnloop_parse_cmd(isdnloop_card *card)
>  	case 7:
>  		/* 0x;EAZ */
>  		p += 3;
> +		if (strlen(p) >= sizeof(card->eazlist[0]))
> +			break;
>  		strcpy(card->eazlist[ch - 1], p);
>  		break;
>  	case 8:

If you've done the strlen() you might as well use memcpy().
There are also functions that will do a bounded strlen(),
(eg memchr()).

	David



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