drm/radeon/si: make sure mc ucode is loaded before checking the size

Avoid a possible segfault.

Noticed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index 86f8c9c87f5c..ac708e006180 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;