From: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Date: Sun, 5 Jul 2009 19:48:35 +0000 (+0000)
Subject: tun/tap: Fix crashes if open() /dev/net/tun and then poll() it.
X-Git-Tag: v2.6.31-rc3~70^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13;p=pandora-kernel.git

tun/tap: Fix crashes if open() /dev/net/tun and then poll() it.

Fix NULL pointer dereference in tun_chr_pool() introduced by commit
33dccbb050bbe35b88ca8cf1228dcf3e4d4b3554 ("tun: Limit amount of queued
packets per device") and triggered by this code:

	int fd;
	struct pollfd pfd;
	fd = open("/dev/net/tun", O_RDWR);
	pfd.fd = fd;
	pfd.events = POLLIN | POLLOUT;
	poll(&pfd, 1, 0);

Reported-by: Eugene Kapun <abacabadabacaba@gmail.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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