linux-kernel - [PATCH 3.12 045/146] drm/radeon/si: make sure mc ucode is loaded before checking the size

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Message-Id: <5bbd7bffabfb02b0467ccd3c6ade2b32c738eb70.1402303820.git.jslaby@suse.cz>
Date:	Mon,  9 Jun 2014 10:49:40 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Alex Deucher <alexdeucher@...il.com>,
	Alex Deucher <alexander.deucher@....com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 045/146] drm/radeon/si: make sure mc ucode is loaded before checking the size

From: Alex Deucher <alexdeucher@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 8c79bae6a30f606b7a4e17c994bc5f72f8fdaf11 upstream.

Avoid a possible segfault.

Noticed-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/radeon/si.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index de0c2bfcc7fc..bbd83f5aa75d 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -1475,11 +1475,13 @@ static int si_mc_load_microcode(struct radeon_device *rdev)
 	const __be32 *fw_data;
 	u32 running, blackout = 0;
 	u32 *io_mc_regs;
-	int i, regs_size, ucode_size = rdev->mc_fw->size / 4;
+	int i, regs_size, ucode_size;
 
 	if (!rdev->mc_fw)
 		return -EINVAL;
 
+	ucode_size = rdev->mc_fw->size / 4;
+
 	switch (rdev->family) {
 	case CHIP_TAHITI:
 		io_mc_regs = (u32 *)&tahiti_io_mc_regs;
-- 
1.9.3

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