This is a note to let you know that I've just added the patch titled
wifi: ath11k: Fix SKB corruption in REO destination ring
to the 5.15-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:
wifi-ath11k-fix-skb-corruption-in-reo-destination-ri.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f3c99297146e947f5f9e7738df51144d2b88b6bb
Author: Nagarajan Maran <quic_nmaran@xxxxxxxxxxx>
Date: Mon Apr 17 13:35:02 2023 +0300
wifi: ath11k: Fix SKB corruption in REO destination ring
[ Upstream commit f9fff67d2d7ca6fa8066132003a3deef654c55b1 ]
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 <quic_nmaran@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230403191533.28114-1-quic_nmaran@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index 3c64d33d0133b..357abd87d5491 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -354,10 +354,10 @@ 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);
@@ -2602,6 +2602,9 @@ 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);
