tree 7c60ab7e391f73ffcbcb98613ee454f843d7b3d1
parent 1ded3f59f35a2642852b3e2a1c0fa8a97777e9af
author Mariusz Kozlowski <m.kozlowski@tuxland.pl> 1246823315 +0000
committer David S. Miller <davem@davemloft.net> 1246909627 -0700

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>