While running traffics for a long time, randomly an RX descriptor
filled with value "0" from REO destination ring is received.
This descriptor which is invalid causes the wrong SKB (SKB stored in
the IDR lookup with buffer id "0") to be fetched which in turn
causes SKB memory corruption issue and the same leads to crash
after some time.
Changed the start id for idr allocation to "1" and the buffer id "0"
is reserved for error validation. Introduced Sanity check to validate
the descriptor, before processing the SKB.
Crash Signature :
Unable to handle kernel paging request at virtual address 3f004900
PC points to "b15_dma_inv_range+0x30/0x50"
LR points to "dma_cache_maint_page+0x8c/0x128".
The Backtrace obtained is as follows:
[<8031716c>] (b15_dma_inv_range) from [<80313a4c>] (dma_cache_maint_page+0x8c/0x128)
[<80313a4c>] (dma_cache_maint_page) from [<80313b90>] (__dma_page_dev_to_cpu+0x28/0xcc)
[<80313b90>] (__dma_page_dev_to_cpu) from [<7fb5dd68>] (ath11k_dp_process_rx+0x1e8/0x4a4 [ath11k])
[<7fb5dd68>] (ath11k_dp_process_rx [ath11k]) from [<7fb53c20>] (ath11k_dp_service_srng+0xb0/0x2ac [ath11k])
[<7fb53c20>] (ath11k_dp_service_srng [ath11k]) from [<7f67bba4>] (ath11k_pci_ext_grp_napi_poll+0x1c/0x78 [ath11k_pci])
[<7f67bba4>] (ath11k_pci_ext_grp_napi_poll [ath11k_pci]) from [<807d5cf4>] (__napi_poll+0x28/0xb8)
[<807d5cf4>] (__napi_poll) from [<807d5f28>] (net_rx_action+0xf0/0x280)
[<807d5f28>] (net_rx_action) from [<80302148>] (__do_softirq+0xd0/0x280)
[<80302148>] (__do_softirq) from [<80320408>] (irq_exit+0x74/0xd4)
[<80320408>] (irq_exit) from [<803638a4>] (__handle_domain_irq+0x90/0xb4)
[<803638a4>] (__handle_domain_irq) from [<805bedec>] (gic_handle_irq+0x58/0x90)
[<805bedec>] (gic_handle_irq) from [<80301a78>] (__irq_svc+0x58/0x8c)
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
Signed-off-by: Nagarajan Maran <[email protected]>
---
drivers/net/wireless/ath/ath11k/dp_rx.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index 99859b59138e..4f51123a3ccd 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -389,10 +389,10 @@ int ath11k_dp_rxbufs_replenish(struct ath11k_base *ab, int mac_id,
goto fail_free_skb;
spin_lock_bh(&rx_ring->idr_lock);
- buf_id = idr_alloc(&rx_ring->bufs_idr, skb, 0,
- rx_ring->bufs_max * 3, GFP_ATOMIC);
+ buf_id = idr_alloc(&rx_ring->bufs_idr, skb, 1,
+ (rx_ring->bufs_max * 3) + 1, GFP_ATOMIC);
spin_unlock_bh(&rx_ring->idr_lock);
- if (buf_id < 0)
+ if (buf_id <= 0)
goto fail_dma_unmap;
desc = ath11k_hal_srng_src_get_next_entry(ab, srng);
@@ -2642,6 +2642,8 @@ int ath11k_dp_process_rx(struct ath11k_base *ab, int ring_id,
cookie);
mac_id = FIELD_GET(DP_RXDMA_BUF_COOKIE_PDEV_ID, cookie);
+ if (unlikely(buf_id == 0))
+ continue;
ar = ab->pdevs[mac_id].ar;
rx_ring = &ar->dp.rx_refill_buf_ring;
spin_lock_bh(&rx_ring->idr_lock);
base-commit: bea046575a2e6d7d1cf63cc7ab032647a3585de5
--
2.17.1
Nagarajan Maran <[email protected]> wrote:
> While running traffics for a long time, randomly an RX descriptor
> filled with value "0" from REO destination ring is received.
> This descriptor which is invalid causes the wrong SKB (SKB stored in
> the IDR lookup with buffer id "0") to be fetched which in turn
> causes SKB memory corruption issue and the same leads to crash
> after some time.
>
> Changed the start id for idr allocation to "1" and the buffer id "0"
> is reserved for error validation. Introduced Sanity check to validate
> the descriptor, before processing the SKB.
>
> Crash Signature :
>
> Unable to handle kernel paging request at virtual address 3f004900
> PC points to "b15_dma_inv_range+0x30/0x50"
> LR points to "dma_cache_maint_page+0x8c/0x128".
> The Backtrace obtained is as follows:
> [<8031716c>] (b15_dma_inv_range) from [<80313a4c>] (dma_cache_maint_page+0x8c/0x128)
> [<80313a4c>] (dma_cache_maint_page) from [<80313b90>] (__dma_page_dev_to_cpu+0x28/0xcc)
> [<80313b90>] (__dma_page_dev_to_cpu) from [<7fb5dd68>] (ath11k_dp_process_rx+0x1e8/0x4a4 [ath11k])
> [<7fb5dd68>] (ath11k_dp_process_rx [ath11k]) from [<7fb53c20>] (ath11k_dp_service_srng+0xb0/0x2ac [ath11k])
> [<7fb53c20>] (ath11k_dp_service_srng [ath11k]) from [<7f67bba4>] (ath11k_pci_ext_grp_napi_poll+0x1c/0x78 [ath11k_pci])
> [<7f67bba4>] (ath11k_pci_ext_grp_napi_poll [ath11k_pci]) from [<807d5cf4>] (__napi_poll+0x28/0xb8)
> [<807d5cf4>] (__napi_poll) from [<807d5f28>] (net_rx_action+0xf0/0x280)
> [<807d5f28>] (net_rx_action) from [<80302148>] (__do_softirq+0xd0/0x280)
> [<80302148>] (__do_softirq) from [<80320408>] (irq_exit+0x74/0xd4)
> [<80320408>] (irq_exit) from [<803638a4>] (__handle_domain_irq+0x90/0xb4)
> [<803638a4>] (__handle_domain_irq) from [<805bedec>] (gic_handle_irq+0x58/0x90)
> [<805bedec>] (gic_handle_irq) from [<80301a78>] (__irq_svc+0x58/0x8c)
>
> Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
>
> Signed-off-by: Nagarajan Maran <[email protected]>
> Signed-off-by: Kalle Valo <[email protected]>
Patch applied to ath-next branch of ath.git, thanks.
f9fff67d2d7c wifi: ath11k: Fix SKB corruption in REO destination ring
--
https://patchwork.kernel.org/project/linux-wireless/patch/[email protected]/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches