Search Linux Wireless

[PATCH 1/3] ath10k: protect src_ring state with ce_lock in tx_sg()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



It was possible to read invalid state of CE ring
buffer indexes. This could lead to scatter-gather
transfer failure in mid-way and crash firmware
later by leaving garbage data on the ring.

Reported-By: Avery Pennarun <apenwarr@xxxxxxxxx>
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
 drivers/net/wireless/ath/ath10k/pci.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 91d6076..04d8cbf 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -762,13 +762,17 @@ static int ath10k_pci_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
 	struct ath10k_pci_pipe *pci_pipe = &ar_pci->pipe_info[pipe_id];
 	struct ath10k_ce_pipe *ce_pipe = pci_pipe->ce_hdl;
 	struct ath10k_ce_ring *src_ring = ce_pipe->src_ring;
-	unsigned int nentries_mask = src_ring->nentries_mask;
-	unsigned int sw_index = src_ring->sw_index;
-	unsigned int write_index = src_ring->write_index;
+	unsigned int nentries_mask;
+	unsigned int sw_index;
+	unsigned int write_index;
 	int err, i;
 
 	spin_lock_bh(&ar_pci->ce_lock);
 
+	nentries_mask = src_ring->nentries_mask;
+	sw_index = src_ring->sw_index;
+	write_index = src_ring->write_index;
+
 	if (unlikely(CE_RING_DELTA(nentries_mask,
 				   write_index, sw_index - 1) < n_items)) {
 		err = -ENOBUFS;
-- 
1.8.5.3

--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Wireless Personal Area Network]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]

  Powered by Linux