linux-kernel - [PATCH 3.14 072/228] drm/radeon/si: make sure mc ucode is loaded before checking the size

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Message-Id: <20140604232350.363497933@linuxfoundation.org>
Date:	Wed,  4 Jun 2014 16:21:41 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 3.14 072/228] drm/radeon/si: make sure mc ucode is loaded before checking the size

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

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

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

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/radeon/si.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -1472,11 +1472,13 @@ int si_mc_load_microcode(struct radeon_d
 	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;


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