This is a note to let you know that I've just added the patch titled iavf: Fix double free in iavf_reset_task to the 5.16-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iavf-fix-double-free-in-iavf_reset_task.patch and it can be found in the queue-5.16 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 01e701f7128b1afd44c7988aacfe680131606673 Author: Przemyslaw Patynowski <przemyslawx.patynowski@xxxxxxxxx> Date: Wed Mar 9 16:37:39 2022 +0100 iavf: Fix double free in iavf_reset_task [ Upstream commit 16b2dd8cdf6f4e0597c34899de74b4d012b78188 ] Fix double free possibility in iavf_disable_vf, as crit_lock is freed in caller, iavf_reset_task. Add kernel-doc for iavf_disable_vf. Remove mutex_unlock in iavf_disable_vf. Without this patch there is double free scenario, when calling iavf_reset_task. Fixes: e85ff9c631e1 ("iavf: Fix deadlock in iavf_reset_task") Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@xxxxxxxxx> Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Signed-off-by: Mateusz Palczewski <mateusz.palczewski@xxxxxxxxx> Tested-by: Konrad Jankowski <konrad0.jankowski@xxxxxxxxx> Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c index 138db07bdfa8..f2ce30366484 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_main.c +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c @@ -2133,6 +2133,13 @@ static void iavf_watchdog_task(struct work_struct *work) queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ * 2); } +/** + * iavf_disable_vf - disable VF + * @adapter: board private structure + * + * Set communication failed flag and free all resources. + * NOTE: This function is expected to be called with crit_lock being held. + **/ static void iavf_disable_vf(struct iavf_adapter *adapter) { struct iavf_mac_filter *f, *ftmp; @@ -2187,7 +2194,6 @@ static void iavf_disable_vf(struct iavf_adapter *adapter) memset(adapter->vf_res, 0, IAVF_VIRTCHNL_VF_RESOURCE_SIZE); iavf_shutdown_adminq(&adapter->hw); adapter->netdev->flags &= ~IFF_UP; - mutex_unlock(&adapter->crit_lock); adapter->flags &= ~IAVF_FLAG_RESET_PENDING; iavf_change_state(adapter, __IAVF_DOWN); wake_up(&adapter->down_waitqueue);