linux-kernel - [PATCH 1/4] staging: et131x: zero allocation of fbr to prevent random address access

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Date:	Tue, 23 Sep 2014 20:41:11 +0100
From:	Mark Einon <mark.einon@...il.com>
To:	gregkh@...uxfoundation.org
Cc:	devel@...verdev.osuosl.org, tklauser@...tanz.ch,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mark Einon <mark.einon@...il.com>
Subject: [PATCH 1/4] staging: et131x: zero allocation of fbr to prevent random address access

If et131x_rx_dma_memory_alloc() allocates rx_ring->fbr[0] but fails to
allocate rx_ring->fbr[1], this leaves fbr[0]->ring_virtaddr with the
possibility of being accessed in et131x_rx_dma_memory_free() as it
contains a random value, potentially causing an oops.

Fix this by zeroing the fbr memory on allocation. Subsequent frees of
this fbr memory explicitly zeros the ring_virtaddr value.

Reported-by: Tobias Klauser <tklauser@...tanz.ch>
Signed-off-by: Mark Einon <mark.einon@...il.com>
---
 drivers/staging/et131x/et131x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index 93afd61..2889f86 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -2003,10 +2003,10 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
 	struct fbr_lookup *fbr;
 
 	/* Alloc memory for the lookup table */
-	rx_ring->fbr[0] = kmalloc(sizeof(*fbr), GFP_KERNEL);
+	rx_ring->fbr[0] = kzalloc(sizeof(*fbr), GFP_KERNEL);
 	if (rx_ring->fbr[0] == NULL)
 		return -ENOMEM;
-	rx_ring->fbr[1] = kmalloc(sizeof(*fbr), GFP_KERNEL);
+	rx_ring->fbr[1] = kzalloc(sizeof(*fbr), GFP_KERNEL);
 	if (rx_ring->fbr[1] == NULL)
 		return -ENOMEM;
 
-- 
2.1.0

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