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net: ipconfig: fix use after free

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ic_close_devs() calls kfree() for all devices's ic_device. Since commit
2647cffb2b ("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: 2647cffb2b ("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>
This commit is contained in:
Uwe Kleine-König 2016-08-10 11:44:17 +02:00 committed by David S. Miller
parent 0184165b2f
commit 9c706a49d6
1 changed files with 9 additions and 8 deletions
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17
net/ipv4/ipconfig.c
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@ -1492,14 +1492,6 @@ static int __init ip_auto_config(void)
if (ic_defaults() < 0)
return -1;
/*
* Close all network devices except the device we've
* autoconfigured and set up routes.
*/
ic_close_devs();
if (ic_setup_if() < 0 || ic_setup_routes() < 0)
return -1;
/*
* Record which protocol was actually used.
*/
@ -1534,6 +1526,15 @@ static int __init ip_auto_config(void)
pr_cont("\n");
#endif /* !SILENT */
/*
* Close all network devices except the device we've
* autoconfigured and set up routes.
*/
ic_close_devs();
if (ic_setup_if() < 0 || ic_setup_routes() < 0)
return -1;
return 0;
}