diff options
| author | Zekun Shen <bruceshenzk@gmail.com> | 2020-06-15 11:50:29 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-06-15 13:20:14 -0700 |
| commit | e89df5c4322c1bf495f62d74745895b5fd2a4393 (patch) | |
| tree | 2c73ec0ca58c7e7e2e2efc60f4b4cefc0b510702 | |
| parent | dff515a3e71dc8ab3b9dcc2e23a9b5fca88b3c18 (diff) | |
| download | linux-e89df5c4322c1bf495f62d74745895b5fd2a4393.tar.gz | |
net: alx: fix race condition in alx_remove
There is a race condition exist during termination. The path is
alx_stop and then alx_remove. An alx_schedule_link_check could be called
before alx_stop by interrupt handler and invoke alx_link_check later.
Alx_stop frees the napis, and alx_remove cancels any pending works.
If any of the work is scheduled before termination and invoked before
alx_remove, a null-ptr-deref occurs because both expect alx->napis[i].
This patch fix the race condition by moving cancel_work_sync functions
before alx_free_napis inside alx_stop. Because interrupt handler can call
alx_schedule_link_check again, alx_free_irq is moved before
cancel_work_sync calls too.
Signed-off-by: Zekun Shen <bruceshenzk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/atheros/alx/main.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c index b9b4edb913c13..9b7f1af5f5747 100644 --- a/drivers/net/ethernet/atheros/alx/main.c +++ b/drivers/net/ethernet/atheros/alx/main.c @@ -1249,8 +1249,12 @@ out_disable_adv_intr: static void __alx_stop(struct alx_priv *alx) { - alx_halt(alx); alx_free_irq(alx); + + cancel_work_sync(&alx->link_check_wk); + cancel_work_sync(&alx->reset_wk); + + alx_halt(alx); alx_free_rings(alx); alx_free_napis(alx); } @@ -1855,9 +1859,6 @@ static void alx_remove(struct pci_dev *pdev) struct alx_priv *alx = pci_get_drvdata(pdev); struct alx_hw *hw = &alx->hw; - cancel_work_sync(&alx->link_check_wk); - cancel_work_sync(&alx->reset_wk); - /* restore permanent mac address */ alx_set_macaddr(hw, hw->perm_addr); |