From: Tilman Schmidt <tilman@imap.cc>
Date: Sat, 11 Oct 2014 11:46:30 +0000 (+0200)
Subject: isdn/capi: prevent NULL pointer dereference on invalid CAPI command
X-Git-Tag: fixes-against-v3.18-rc2~61^2~49^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5510ab18048397193ae073d6b0d4ea78ff0170f5;p=pandora-kernel.git

isdn/capi: prevent NULL pointer dereference on invalid CAPI command

An invalid CAPI 2.0 command/subcommand combination may retrieve a
NULL pointer from the cpars[] array which will later be dereferenced
by the parser routines.
Fix by adding NULL pointer checks in strategic places.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
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