diff options
| author | Zack Rusin <zackr@vmware.com> | 2023-02-08 13:00:50 -0500 |
|---|---|---|
| committer | Zack Rusin <zackr@vmware.com> | 2023-02-14 22:05:21 -0500 |
| commit | 36d421e632e9a0e8375eaed0143551a34d81a7e3 (patch) | |
| tree | 1185f76b80051a8b8db7b6f8f1fe6955d604d2d5 | |
| parent | a44df74c720eb45d16a92ab9fc8a780d961d5e2b (diff) | |
drm/vmwgfx: Stop accessing buffer objects which failed init
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@vmware.com>
Fixes: 8afa13a0583f ("drm/vmwgfx: Implement DRIVER_GEM")
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230208180050.2093426-1-zack@kde.org
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 4 | ||||
| -rw-r--r-- | 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 ee8f87dcdf21..7a00314882a3 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c @@ -416,13 +416,15 @@ 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, params, vmw_bo_free); if (unlikely(ret != 0)) goto out_error; 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 f042e22b8b59..51bd1f8c5cc4 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gem.c @@ -127,11 +127,11 @@ int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv, }; ret = vmw_bo_create(dev_priv, ¶ms, p_vbo); - - (*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs; if (ret != 0) goto out_no_bo; + (*p_vbo)->tbo.base.funcs = &vmw_gem_object_funcs; + ret = drm_gem_handle_create(filp, &(*p_vbo)->tbo.base, handle); /* drop reference from allocate - handle holds it now */ drm_gem_object_put(&(*p_vbo)->tbo.base); |