drm/amdgpu: fix amdgpu_cs_p1_user_fence

commit 35588314e963938dfdcdb792c9170108399377d6 upstream.

The offset is just 32bits here so this can potentially overflow if
somebody specifies a large value. Instead reduce the size to calculate
the last possible offset.

The error handling path incorrectly drops the reference to the user
fence BO resulting in potential reference count underflow.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 02a112d..4624160 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -120,7 +120,6 @@ static int amdgpu_cs_p1_user_fence(struct amdgpu_cs_parser *p,
        struct drm_gem_object *gobj;
        struct amdgpu_bo *bo;
        unsigned long size;
-       int r;
 
        gobj = drm_gem_object_lookup(p->filp, data->handle);
        if (gobj == NULL)
@@ -132,23 +131,14 @@ static int amdgpu_cs_p1_user_fence(struct amdgpu_cs_parser *p,
        drm_gem_object_put(gobj);
 
        size = amdgpu_bo_size(bo);
-       if (size != PAGE_SIZE || (data->offset + 8) > size) {
-               r = -EINVAL;
-               goto error_unref;
-       }
+       if (size != PAGE_SIZE || data->offset > (size - 8))
+               return -EINVAL;
 
-       if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm)) {
-               r = -EINVAL;
-               goto error_unref;
-       }
+       if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
+               return -EINVAL;
 
        *offset = data->offset;
-
        return 0;
-
-error_unref:
-       amdgpu_bo_unref(&bo);
-       return r;
 }
 
 static int amdgpu_cs_p1_bo_handles(struct amdgpu_cs_parser *p,