From: Alexander Duyck Date: Wed, 2 May 2012 21:19:14 +0000 (+0000) Subject: ixgbe: Fix use after free on module remove X-Git-Tag: v3.5-rc1~109^2~183 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=af94bf6db1d58d26f1cdab145b6312ad363254a6;p=karo-tx-linux.git ixgbe: Fix use after free on module remove While testing the TCP changes I had to fix an issue in order to be able to load and unload the module. The recent patch that added thermal sensor support added a use after free bug on module unload with an 82598 adapter in the system. To resolve the issue I have updated the code so that when we free the info_kobj we set it back to NULL. I suspect there are likely other bugs present, but I will leave that for another patch that can undergo more testing. I am submitting this directly to net-next since this fixes a fairly serious bug that will lock up the ixgbe module until the system is rebooted. Signed-off-by: Alexander Duyck Cc: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c index aa41fb705469..f81c166dc5a8 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c @@ -185,8 +185,10 @@ static void ixgbe_sysfs_del_adapter(struct ixgbe_adapter *adapter) hwmon_device_unregister(adapter->ixgbe_hwmon_buff.device); #endif /* CONFIG_IXGBE_HWMON */ - if (adapter->info_kobj != NULL) + if (adapter->info_kobj != NULL) { kobject_put(adapter->info_kobj); + adapter->info_kobj = NULL; + } } /* called from ixgbe_main.c */