| Message ID | 1476109278-7957-1-git-send-email-vthiagar@qti.qualcomm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Kalle Valo |
| Headers | show |
Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com> wrote: > arvifs list is traversed within data_lock spin_lock in tasklet > context to fill channel information from the corresponding vif. > This means any access to arvifs list for add/del operations > should also be protected with the same spin_lock to avoid the > race. Fix this by performing list add/del on arvfis within the > data_lock. This could fix kernel panic something like the below. > > LR is at ath10k_htt_rx_pktlog_completion_handler+0x100/0xb6c [ath10k_core] > PC is at ath10k_htt_rx_pktlog_completion_handler+0x1c0/0xb6c [ath10k_core] > Internal error: Oops: 17 [#1] PREEMPT SMP ARM > [<bf4857f4>] (ath10k_htt_rx_pktlog_completion_handler+0x2f4/0xb6c [ath10k_core]) > [<bf487540>] (ath10k_htt_txrx_compl_task+0x8b4/0x1188 [ath10k_core]) > [<c00312d4>] (tasklet_action+0x8c/0xec) > [<c00309a8>] (__do_softirq+0xdc/0x208) > [<c0030d6c>] (irq_exit+0x84/0xe0) > [<c005db04>] (__handle_domain_irq+0x80/0xa0) > [<c00085c4>] (gic_handle_irq+0x38/0x5c) > [<c0009640>] (__irq_svc+0x40/0x74) > > (gdb) list *(ath10k_htt_rx_pktlog_completion_handler+0x1c0) > 0x136c0 is in ath10k_htt_rx_h_channel (drivers/net/wireless/ath/ath10k/htt_rx.c:769) > 764 struct cfg80211_chan_def def; > 765 > 766 lockdep_assert_held(&ar->data_lock); > 767 > 768 list_for_each_entry(arvif, &ar->arvifs, list) { > 769 if (arvif->vdev_id == vdev_id && > 770 ath10k_mac_vif_chan(arvif->vif, &def) == 0) > 771 return def.chan; > 772 } > 773 > > Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com> Patch applied to ath-next branch of ath.git, thanks. ebaa4b1620bf ath10k: fix kernel panic due to race in accessing arvif list
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index 2e5d2ca..691b7b5 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -4931,7 +4931,9 @@ static int ath10k_add_interface(struct ieee80211_hw *hw, } ar->free_vdev_map &= ~(1LL << arvif->vdev_id); + spin_lock_bh(&ar->data_lock); list_add(&arvif->list, &ar->arvifs); + spin_unlock_bh(&ar->data_lock); /* It makes no sense to have firmware do keepalives. mac80211 already * takes care of this with idle connection polling. @@ -5082,7 +5084,9 @@ err_peer_delete: err_vdev_delete: ath10k_wmi_vdev_delete(ar, arvif->vdev_id); ar->free_vdev_map |= 1LL << arvif->vdev_id; + spin_lock_bh(&ar->data_lock); list_del(&arvif->list); + spin_unlock_bh(&ar->data_lock); err: if (arvif->beacon_buf) { @@ -5128,7 +5132,9 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw, arvif->vdev_id, ret); ar->free_vdev_map |= 1LL << arvif->vdev_id; + spin_lock_bh(&ar->data_lock); list_del(&arvif->list); + spin_unlock_bh(&ar->data_lock); if (arvif->vdev_type == WMI_VDEV_TYPE_AP || arvif->vdev_type == WMI_VDEV_TYPE_IBSS) {
arvifs list is traversed within data_lock spin_lock in tasklet context to fill channel information from the corresponding vif. This means any access to arvifs list for add/del operations should also be protected with the same spin_lock to avoid the race. Fix this by performing list add/del on arvfis within the data_lock. This could fix kernel panic something like the below. LR is at ath10k_htt_rx_pktlog_completion_handler+0x100/0xb6c [ath10k_core] PC is at ath10k_htt_rx_pktlog_completion_handler+0x1c0/0xb6c [ath10k_core] Internal error: Oops: 17 [#1] PREEMPT SMP ARM [<bf4857f4>] (ath10k_htt_rx_pktlog_completion_handler+0x2f4/0xb6c [ath10k_core]) [<bf487540>] (ath10k_htt_txrx_compl_task+0x8b4/0x1188 [ath10k_core]) [<c00312d4>] (tasklet_action+0x8c/0xec) [<c00309a8>] (__do_softirq+0xdc/0x208) [<c0030d6c>] (irq_exit+0x84/0xe0) [<c005db04>] (__handle_domain_irq+0x80/0xa0) [<c00085c4>] (gic_handle_irq+0x38/0x5c) [<c0009640>] (__irq_svc+0x40/0x74) (gdb) list *(ath10k_htt_rx_pktlog_completion_handler+0x1c0) 0x136c0 is in ath10k_htt_rx_h_channel (drivers/net/wireless/ath/ath10k/htt_rx.c:769) 764 struct cfg80211_chan_def def; 765 766 lockdep_assert_held(&ar->data_lock); 767 768 list_for_each_entry(arvif, &ar->arvifs, list) { 769 if (arvif->vdev_id == vdev_id && 770 ath10k_mac_vif_chan(arvif->vif, &def) == 0) 771 return def.chan; 772 } 773 Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com> --- drivers/net/wireless/ath/ath10k/mac.c | 6 ++++++ 1 file changed, 6 insertions(+)