[PATCH] drm/msm/adreno: Ensure that the zap shader region is big enough

[Jordan Crouse]

Before loading the zap shader we should ensure that the reserved memory
region is big enough to hold the loaded file.

Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
---

 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c 
b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 6f7f411..3db8e49 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -67,7 +67,6 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const 
char *fwname,
                return ret;
 
        mem_phys = r.start;
-       mem_size = resource_size(&r);
 
        /* Request the MDT file for the firmware */
        fw = adreno_request_fw(to_adreno_gpu(gpu), fwname);
@@ -83,6 +82,13 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const 
char *fwname,
                goto out;
        }
 
+       if (mem_size > resource_size(&r)) {
+               DRM_DEV_ERROR(dev,
+                       "memory region is too small to load the MDT\n");
+               ret = -E2BIG;
+               goto out;
+       }
+
        /* Allocate memory for the firmware image */
        mem_region = memremap(mem_phys, mem_size,  MEMREMAP_WC);
        if (!mem_region) {
-- 
2.7.4