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From: Michal Kazior <michal.kazior@tieto.com>
To: ath10k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org, Michal Kazior <michal.kazior@tieto.com>
Subject: [PATCH 2/2] ath10k: sanitize tx ring index access properly
Date: Thu,  5 Jun 2014 09:48:40 +0200	[thread overview]
Message-ID: <1401954520-3365-3-git-send-email-michal.kazior@tieto.com> (raw)
In-Reply-To: <1401954520-3365-1-git-send-email-michal.kazior@tieto.com>

The tx ring index was immediately trimmed with a
bitmask. This discarded the 0xFFFFFFFF error case
(which theoretically can happen when a device is
abruptly disconnected) and led to using an invalid
tx ring index. This could lead to memory
corruption.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
---
 drivers/net/wireless/ath/ath10k/ce.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c
index d185dc0..7c6c7d5 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -603,16 +603,19 @@ static int ath10k_ce_completed_send_next_nolock(struct ath10k_ce_pipe *ce_state,
 		if (ret)
 			return ret;
 
-		src_ring->hw_index =
-			ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
-		src_ring->hw_index &= nentries_mask;
+		read_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
+		if (read_index == 0xFFFFFFFF)
+			return -ENODEV;
+
+		read_index &= nentries_mask;
+		src_ring->hw_index = read_index;
 
 		ath10k_pci_sleep(ar);
 	}
 
 	read_index = src_ring->hw_index;
 
-	if ((read_index == sw_index) || (read_index == 0xffffffff))
+	if (read_index == sw_index)
 		return -EIO;
 
 	sbase = src_ring->shadow_base;
-- 
1.8.5.3


WARNING: multiple messages have this Message-ID (diff)
From: Michal Kazior <michal.kazior@tieto.com>
To: ath10k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org, Michal Kazior <michal.kazior@tieto.com>
Subject: [PATCH 2/2] ath10k: sanitize tx ring index access properly
Date: Thu,  5 Jun 2014 09:48:40 +0200	[thread overview]
Message-ID: <1401954520-3365-3-git-send-email-michal.kazior@tieto.com> (raw)
In-Reply-To: <1401954520-3365-1-git-send-email-michal.kazior@tieto.com>

The tx ring index was immediately trimmed with a
bitmask. This discarded the 0xFFFFFFFF error case
(which theoretically can happen when a device is
abruptly disconnected) and led to using an invalid
tx ring index. This could lead to memory
corruption.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
---
 drivers/net/wireless/ath/ath10k/ce.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c
index d185dc0..7c6c7d5 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -603,16 +603,19 @@ static int ath10k_ce_completed_send_next_nolock(struct ath10k_ce_pipe *ce_state,
 		if (ret)
 			return ret;
 
-		src_ring->hw_index =
-			ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
-		src_ring->hw_index &= nentries_mask;
+		read_index = ath10k_ce_src_ring_read_index_get(ar, ctrl_addr);
+		if (read_index == 0xFFFFFFFF)
+			return -ENODEV;
+
+		read_index &= nentries_mask;
+		src_ring->hw_index = read_index;
 
 		ath10k_pci_sleep(ar);
 	}
 
 	read_index = src_ring->hw_index;
 
-	if ((read_index == sw_index) || (read_index == 0xffffffff))
+	if (read_index == sw_index)
 		return -EIO;
 
 	sbase = src_ring->shadow_base;
-- 
1.8.5.3


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  parent reply	other threads:[~2014-06-05  7:56 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-05  7:48 [PATCH 0/2] ath10k: pci fixes 2014-06-05 Michal Kazior
2014-06-05  7:48 ` Michal Kazior
2014-06-05  7:48 ` [PATCH 1/2] ath10k: fix bmi exchange tx/rx race Michal Kazior
2014-06-05  7:48   ` Michal Kazior
2014-06-05  7:48 ` Michal Kazior [this message]
2014-06-05  7:48   ` [PATCH 2/2] ath10k: sanitize tx ring index access properly Michal Kazior
2014-07-14 13:20   ` Kalle Valo
2014-07-14 13:20     ` Kalle Valo
2014-07-15  8:22 ` [PATCH 0/2] ath10k: pci fixes 2014-06-05 Kalle Valo
2014-07-15  8:22   ` Kalle Valo

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