From: Zack Rusin <zackr@xxxxxxxxxx>
commit 1a6897921f52ceb2c8665ef826e405bd96385159 upstream.
ttm_bo_init_reserved on failure puts the buffer object back which
causes it to be deleted, but kfree was still being called on the same
buffer in vmw_bo_create leading to a double free.
After the double free the vmw_gem_object_create_with_handle was
setting the gem function objects before checking the return status
of vmw_bo_create leading to null pointer access.
Fix the entire path by relaying on ttm_bo_init_reserved to delete the
buffer objects on failure and making sure the return status is checked
before setting the gem function objects on the buffer object.
Signed-off-by: Zack Rusin <zackr@xxxxxxxxxx>
Fixes: 8afa13a0583f ("drm/vmwgfx: Implement DRIVER_GEM")
Reviewed-by: Maaz Mombasawala <mombasawalam@xxxxxxxxxx>
Reviewed-by: Martin Krastev <krastevm@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230208180050.2093426-1-zack@xxxxxxx
(cherry picked from commit 36d421e632e9a0e8375eaed0143551a34d81a7e3)
Cc: <stable@xxxxxxxxxxxxxxx> # v5.17+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 4 +++-
drivers/gpu/drm/vmwgfx/vmwgfx_gem.c | 4 ++--
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index aa1cd5126a32..53da183e2bfe 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -462,6 +462,9 @@ int vmw_bo_create(struct vmw_private *vmw,
return -ENOMEM;
}
+ /*
+ * vmw_bo_init will delete the *p_bo object if it fails
+ */
ret = vmw_bo_init(vmw, *p_bo, size,
placement, interruptible, pin,
bo_free);
@@ -470,7 +473,6 @@ int vmw_bo_create(struct vmw_private *vmw,
return ret;
out_error:
- kfree(*p_bo);
*p_bo = NULL;
return ret;
}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c
index ce609e7d758f..83d8f18cc16f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c
@@ -146,11 +146,11 @@ int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
&vmw_sys_placement :
&vmw_vram_sys_placement,
true, false, &vmw_gem_destroy, p_vbo);
-
- (*p_vbo)->base.base.funcs = &vmw_gem_object_funcs;
if (ret != 0)
goto out_no_bo;
+ (*p_vbo)->base.base.funcs = &vmw_gem_object_funcs;
+
ret = drm_gem_handle_create(filp, &(*p_vbo)->base.base, handle);
/* drop reference from allocate - handle holds it now */
drm_gem_object_put(&(*p_vbo)->base.base);
--
2.39.1
