* [PATCH] drm/vmwgfx: Stop accessing buffer objects which failed init
@ 2023-02-08 18:00 Zack Rusin
2023-02-08 22:47 ` "Maaz Mombasawala (VMware)
2023-02-09 13:22 ` Martin Krastev (VMware)
0 siblings, 2 replies; 3+ messages in thread
From: Zack Rusin @ 2023-02-08 18:00 UTC (permalink / raw)
To: dri-devel; +Cc: krastevm, stable, banackm, mombasawalam
From: Zack Rusin <zackr@vmware.com>
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")
Cc: <stable@vger.kernel.org> # v5.17+
---
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 63486802c8fd..43ffa5c7acbd 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -431,13 +431,15 @@ 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);
--
2.38.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/vmwgfx: Stop accessing buffer objects which failed init
2023-02-08 18:00 [PATCH] drm/vmwgfx: Stop accessing buffer objects which failed init Zack Rusin
@ 2023-02-08 22:47 ` "Maaz Mombasawala (VMware)
2023-02-09 13:22 ` Martin Krastev (VMware)
1 sibling, 0 replies; 3+ messages in thread
From: "Maaz Mombasawala (VMware) @ 2023-02-08 22:47 UTC (permalink / raw)
To: Zack Rusin, dri-devel; +Cc: krastevm, mombasawalam, banackm, stable
On 2/8/23 10:00, Zack Rusin wrote:
> From: Zack Rusin <zackr@vmware.com>
>
> 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")
> Cc: <stable@vger.kernel.org> # v5.17+
> ---
> 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 63486802c8fd..43ffa5c7acbd 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> @@ -431,13 +431,15 @@ 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);
LGTM!
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
--
Maaz Mombasawala (VMware) <maazm@fastmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/vmwgfx: Stop accessing buffer objects which failed init
2023-02-08 18:00 [PATCH] drm/vmwgfx: Stop accessing buffer objects which failed init Zack Rusin
2023-02-08 22:47 ` "Maaz Mombasawala (VMware)
@ 2023-02-09 13:22 ` Martin Krastev (VMware)
1 sibling, 0 replies; 3+ messages in thread
From: Martin Krastev (VMware) @ 2023-02-09 13:22 UTC (permalink / raw)
To: Zack Rusin, dri-devel; +Cc: krastevm, mombasawalam, banackm, stable
From: Martin Krastev <krastevm@vmware.com>
Much nicer now.
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Regards,
Martin
On 8.02.23 г. 20:00 ч., Zack Rusin wrote:
> From: Zack Rusin <zackr@vmware.com>
>
> 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")
> Cc: <stable@vger.kernel.org> # v5.17+
> ---
> 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 63486802c8fd..43ffa5c7acbd 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
> @@ -431,13 +431,15 @@ 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);
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-02-08 18:00 [PATCH] drm/vmwgfx: Stop accessing buffer objects which failed init Zack Rusin
2023-02-08 22:47 ` "Maaz Mombasawala (VMware)
2023-02-09 13:22 ` Martin Krastev (VMware)
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