From: Chen Gang <gang.chen@asianux.com>
Date: Thu, 7 Mar 2013 18:25:41 +0000 (+0000)
Subject: drivers/isdn: checkng length to be sure not memory overflow
X-Git-Tag: v3.9-rc3~36^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f39479363e0361c8bb4397481c01a7c3a1a3c8ac;p=pandora-kernel.git

drivers/isdn: checkng length to be sure not memory overflow

sizeof (cmd.parm.cmsg.para) is 50 (MAX_CAPI_PARA_LEN).
  sizeof (cmd.parm) is 80+, but less than 100.
  strlen(msg) may be more than 80+ (Modem-Commandbuffer, less than 255).
    isdn_tty_send_msg is called by isdn_tty_parse_at
    the relative parameter is m->mdmcmd (atemu *m)
    the relative command may be "+M..."

  so need check the length to be sure not memory overflow.
    cmd.parm is a union, and need keep original valid buffer length no touch

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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