linux-kernel - [PATCH 3.4 138/172] radeon: Do not directly dereference pointers to BIOS area.

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Message-Id: <1434443826-4929-138-git-send-email-lizf@kernel.org>
Date:	Tue, 16 Jun 2015 16:36:32 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Alex Deucher <alexander.deucher@....com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 138/172] radeon: Do not directly dereference pointers to BIOS area.

From: David Miller <davem@...emloft.net>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit f2c9e560b406f2f6b14b345c7da33467dee9cdf2 upstream.

Use readb() and memcpy_fromio() accessors instead.

Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/gpu/drm/radeon/radeon_bios.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
index d306cc8..ef56e4e 100644
--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -76,7 +76,7 @@ static bool igp_read_bios_from_vram(struct radeon_device *rdev)
 
 static bool radeon_read_bios(struct radeon_device *rdev)
 {
-	uint8_t __iomem *bios;
+	uint8_t __iomem *bios, val1, val2;
 	size_t size;
 
 	rdev->bios = NULL;
@@ -86,15 +86,19 @@ static bool radeon_read_bios(struct radeon_device *rdev)
 		return false;
 	}
 
-	if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
+	val1 = readb(&bios[0]);
+	val2 = readb(&bios[1]);
+
+	if (size == 0 || val1 != 0x55 || val2 != 0xaa) {
 		pci_unmap_rom(rdev->pdev, bios);
 		return false;
 	}
-	rdev->bios = kmemdup(bios, size, GFP_KERNEL);
+	rdev->bios = kzalloc(size, GFP_KERNEL);
 	if (rdev->bios == NULL) {
 		pci_unmap_rom(rdev->pdev, bios);
 		return false;
 	}
+	memcpy_fromio(rdev->bios, bios, size);
 	pci_unmap_rom(rdev->pdev, bios);
 	return true;
 }
-- 
1.9.1

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