net: ipconfig: fix use after free
authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Wed, 10 Aug 2016 09:44:17 +0000 (11:44 +0200)
committerDavid S. Miller <davem@davemloft.net>
Wed, 10 Aug 2016 21:04:23 +0000 (14:04 -0700)
commit9c706a49d660653625d206f6972541c1f60ea2b0
treefd524586607f08d65224d3bb0a3e175c8e47f1e2
parent0184165b2f42c4b032da9dd11546bfbaeb5afd4e
net: ipconfig: fix use after free

ic_close_devs() calls kfree() for all devices's ic_device. Since commit
2647cffb2bc6 ("net: ipconfig: Support using "delayed" DHCP replies")
the active device's ic_device is still used however to print the
ipconfig summary which results in an oops if the memory is already
changed. So delay freeing until after the autoconfig results are
reported.

Fixes: 2647cffb2bc6 ("net: ipconfig: Support using "delayed" DHCP replies")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ipconfig.c