linux-kernel - [PATCH] vme: Fix wrong pointer utilization in ca91cx42_slave

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Date:   Tue, 10 Jan 2017 10:45:00 +0000
From:   Augusto Mecking Caringi <augustocaringi@...il.com>
To:     Martyn Welch <martyn@...chs.me.uk>
Cc:     Augusto Mecking Caringi <augustocaringi@...il.com>,
        Manohar Vanga <manohar.vanga@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Aaron Sierra <asierra@...-inc.com>,
        Geliang Tang <geliangtang@....com>,
        Alessio Igor Bogani <alessio.bogani@...ttra.eu>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] vme: Fix wrong pointer utilization in ca91cx42_slave_get

In ca91cx42_slave_get function, the value pointed by vme_base pointer is
set through:

*vme_base = ioread32(bridge->base + CA91CX42_VSI_BS[i]);

So it must be dereferenced to be used in calculation of pci_base:

*pci_base = (dma_addr_t)*vme_base + pci_offset;

This bug was caught thanks to the following gcc warning:

drivers/vme/bridges/vme_ca91cx42.c: In function ‘ca91cx42_slave_get’:
drivers/vme/bridges/vme_ca91cx42.c:467:14: warning: cast from pointer to
integer of different size [-Wpointer-to-int-cast]
*pci_base = (dma_addr_t)vme_base + pci_offset;

Signed-off-by: Augusto Mecking Caringi <augustocaringi@...il.com>
---
 drivers/vme/bridges/vme_ca91cx42.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vme/bridges/vme_ca91cx42.c b/drivers/vme/bridges/vme_ca91cx42.c
index 6b5ee89..7cc5122 100644
--- a/drivers/vme/bridges/vme_ca91cx42.c
+++ b/drivers/vme/bridges/vme_ca91cx42.c
@@ -464,7 +464,7 @@ static int ca91cx42_slave_get(struct vme_slave_resource *image, int *enabled,
 	vme_bound = ioread32(bridge->base + CA91CX42_VSI_BD[i]);
 	pci_offset = ioread32(bridge->base + CA91CX42_VSI_TO[i]);
 
-	*pci_base = (dma_addr_t)vme_base + pci_offset;
+	*pci_base = (dma_addr_t)*vme_base + pci_offset;
 	*size = (unsigned long long)((vme_bound - *vme_base) + granularity);
 
 	*enabled = 0;
-- 
2.7.4