[PATCH v2 3/3] drm/vmwgfx: fix potential UAF in vmwgfx_surface.c
From: Desmond Cheong Zhi Xi <hidden>
Date: 2021-07-24 11:19:35
Also in:
dri-devel, intel-gfx, lkml
Subsystem:
drm driver for vmware virtual gpu, drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
Zack Rusin, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
drm_file.master should be protected by either drm_device.master_mutex or drm_file.master_lookup_lock when being dereferenced. However, drm_master_get is called on unprotected file_priv->master pointers in vmw_surface_define_ioctl and vmw_gb_surface_define_internal. This is fixed by replacing drm_master_get with drm_file_get_master. Signed-off-by: Desmond Cheong Zhi Xi <redacted> Reviewed-by: Daniel Vetter <redacted> Reviewed-by: Zack Rusin <redacted> --- drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 0eba47762bed..5d53a5f9d123 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c@@ -865,7 +865,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data, user_srf->prime.base.shareable = false; user_srf->prime.base.tfile = NULL; if (drm_is_primary_client(file_priv)) - user_srf->master = drm_master_get(file_priv->master); + user_srf->master = drm_file_get_master(file_priv); /** * From this point, the generic resource management functions
@@ -1534,7 +1534,7 @@ vmw_gb_surface_define_internal(struct drm_device *dev, user_srf = container_of(srf, struct vmw_user_surface, srf); if (drm_is_primary_client(file_priv)) - user_srf->master = drm_master_get(file_priv->master); + user_srf->master = drm_file_get_master(file_priv); res = &user_srf->srf.res;
--
2.25.1
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