| Message ID | 20230809042738.13394-2-quic_hprem@quicinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | wifi: ath12k: Ignore fragments from uninitialized peer in dp | expand |
On 8/8/2023 9:27 PM, Harshitha Prem wrote: > When max virtual ap interfaces are configured in all the bands > with ACS and hostapd restart is done every 60s, > a crash is observed at random times. nit: please fill the paragraph to 70+ columns > > In the above scenario, a fragmented packet is received for self peer, > for which rx_tid and rx_frags are not initialized in datapath. > While handling this fragment, crash is observed as the rx_frag list > is uninitialised and when we walk in ath12k_dp_rx_h_sort_frags, nit: s/uninitialised /uninitialized/ > skb null leads to exception. > > To address this, before processing received fragments we check > dp_setup_done flag is set to ensure that peer has completed its > dp peer setup for fragment queue, else ignore processing the > fragments. > > Call trace: > PC points to "ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k]" > LR points to "ath12k_dp_process_rx_err+0x480/0xfcc [ath12k]". > The Backtrace obtained is as follows: > ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k] > ath12k_dp_service_srng+0x78/0x260 [ath12k] > ath12k_pci_write32+0x990/0xb0c [ath12k] > __napi_poll+0x30/0xa4 > net_rx_action+0x118/0x270 > __do_softirq+0x10c/0x244 > irq_exit+0x64/0xb4 > __handle_domain_irq+0x88/0xac > gic_handle_irq+0x74/0xbc > el1_irq+0xf0/0x1c0 > arch_cpu_idle+0x10/0x18 > do_idle+0x104/0x248 > cpu_startup_entry+0x20/0x64 > rest_init+0xd0/0xdc > arch_call_rest_init+0xc/0x14 > > Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 > > Signed-off-by: Harshitha Prem <quic_hprem@quicinc.com> > --- actual code patch LGTM
On 8/9/2023 11:41 PM, Jeff Johnson wrote: > On 8/8/2023 9:27 PM, Harshitha Prem wrote: >> When max virtual ap interfaces are configured in all the bands >> with ACS and hostapd restart is done every 60s, >> a crash is observed at random times. > > nit: please fill the paragraph to 70+ columns > >> >> In the above scenario, a fragmented packet is received for self peer, >> for which rx_tid and rx_frags are not initialized in datapath. >> While handling this fragment, crash is observed as the rx_frag list >> is uninitialised and when we walk in ath12k_dp_rx_h_sort_frags, > > nit: s/uninitialised /uninitialized/ > >> skb null leads to exception. >> >> To address this, before processing received fragments we check >> dp_setup_done flag is set to ensure that peer has completed its >> dp peer setup for fragment queue, else ignore processing the >> fragments. >> >> Call trace: >> PC points to "ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k]" >> LR points to "ath12k_dp_process_rx_err+0x480/0xfcc [ath12k]". >> The Backtrace obtained is as follows: >> ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k] >> ath12k_dp_service_srng+0x78/0x260 [ath12k] >> ath12k_pci_write32+0x990/0xb0c [ath12k] >> __napi_poll+0x30/0xa4 >> net_rx_action+0x118/0x270 >> __do_softirq+0x10c/0x244 >> irq_exit+0x64/0xb4 >> __handle_domain_irq+0x88/0xac >> gic_handle_irq+0x74/0xbc >> el1_irq+0xf0/0x1c0 >> arch_cpu_idle+0x10/0x18 >> do_idle+0x104/0x248 >> cpu_startup_entry+0x20/0x64 >> rest_init+0xd0/0xdc >> arch_call_rest_init+0xc/0x14 >> >> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 >> >> Signed-off-by: Harshitha Prem <quic_hprem@quicinc.com> >> --- > > actual code patch LGTM > Thank you Jeff. Sure, will update the commit message. Thanks, Harshitha
diff --git a/drivers/net/wireless/ath/ath12k/dp.c b/drivers/net/wireless/ath/ath12k/dp.c index ae1645d0f42a..d825e08d820a 100644 --- a/drivers/net/wireless/ath/ath12k/dp.c +++ b/drivers/net/wireless/ath/ath12k/dp.c @@ -38,6 +38,7 @@ void ath12k_dp_peer_cleanup(struct ath12k *ar, int vdev_id, const u8 *addr) ath12k_dp_rx_peer_tid_cleanup(ar, peer); crypto_free_shash(peer->tfm_mmic); + peer->dp_setup_done = false; spin_unlock_bh(&ab->base_lock); } diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index 67f8c140840f..5923c7c9eaff 100644 --- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -2748,6 +2748,7 @@ int ath12k_dp_rx_peer_frag_setup(struct ath12k *ar, const u8 *peer_mac, int vdev } peer->tfm_mmic = tfm; + peer->dp_setup_done = true; spin_unlock_bh(&ab->base_lock); return 0; @@ -3214,6 +3215,14 @@ static int ath12k_dp_rx_frag_h_mpdu(struct ath12k *ar, ret = -ENOENT; goto out_unlock; } + + if (!peer->dp_setup_done) { + ath12k_warn(ab, "The peer %pM [%d] has uninitialized datapath\n", + peer->addr, peer_id); + ret = -ENOENT; + goto out_unlock; + } + rx_tid = &peer->rx_tid[tid]; if ((!skb_queue_empty(&rx_tid->rx_frags) && seqno != rx_tid->cur_sn) || diff --git a/drivers/net/wireless/ath/ath12k/peer.h b/drivers/net/wireless/ath/ath12k/peer.h index b296dc0e2f67..c6edb24cbedd 100644 --- a/drivers/net/wireless/ath/ath12k/peer.h +++ b/drivers/net/wireless/ath/ath12k/peer.h @@ -44,6 +44,9 @@ struct ath12k_peer { struct ppdu_user_delayba ppdu_stats_delayba; bool delayba_flag; bool is_authorized; + + /* protected by ab->data_lock */ + bool dp_setup_done; }; void ath12k_peer_unmap_event(struct ath12k_base *ab, u16 peer_id);
When max virtual ap interfaces are configured in all the bands with ACS and hostapd restart is done every 60s, a crash is observed at random times. In the above scenario, a fragmented packet is received for self peer, for which rx_tid and rx_frags are not initialized in datapath. While handling this fragment, crash is observed as the rx_frag list is uninitialised and when we walk in ath12k_dp_rx_h_sort_frags, skb null leads to exception. To address this, before processing received fragments we check dp_setup_done flag is set to ensure that peer has completed its dp peer setup for fragment queue, else ignore processing the fragments. Call trace: PC points to "ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k]" LR points to "ath12k_dp_process_rx_err+0x480/0xfcc [ath12k]". The Backtrace obtained is as follows: ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k] ath12k_dp_service_srng+0x78/0x260 [ath12k] ath12k_pci_write32+0x990/0xb0c [ath12k] __napi_poll+0x30/0xa4 net_rx_action+0x118/0x270 __do_softirq+0x10c/0x244 irq_exit+0x64/0xb4 __handle_domain_irq+0x88/0xac gic_handle_irq+0x74/0xbc el1_irq+0xf0/0x1c0 arch_cpu_idle+0x10/0x18 do_idle+0x104/0x248 cpu_startup_entry+0x20/0x64 rest_init+0xd0/0xdc arch_call_rest_init+0xc/0x14 Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 Signed-off-by: Harshitha Prem <quic_hprem@quicinc.com> --- drivers/net/wireless/ath/ath12k/dp.c | 1 + drivers/net/wireless/ath/ath12k/dp_rx.c | 9 +++++++++ drivers/net/wireless/ath/ath12k/peer.h | 3 +++ 3 files changed, 13 insertions(+)