[PATCH 1/2] drm/radeon/si: make sure mc ucode is loaded before checking the size

[Alex Deucher]

Avoid a possible segfault.

Noticed-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at vger.kernel.org
---
 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 86f8c9c..ac708e0 100644
--- 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_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;
-- 
1.8.3.1