linux-kernel - [PATCH 4.20 43/50] drm/vmwgfx: Return error code from vmw_execbuf_copy_fence

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Message-Id: <20190213183659.085545585@linuxfoundation.org>
Date:   Wed, 13 Feb 2019 19:38:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Hellstrom <thellstrom@...are.com>,
        Deepak Rawat <drawat@...are.com>
Subject: [PATCH 4.20 43/50] drm/vmwgfx: Return error code from vmw_execbuf_copy_fence_user

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Hellstrom <thellstrom@...are.com>

commit 728354c005c36eaf44b6e5552372b67e60d17f56 upstream.

The function was unconditionally returning 0, and a caller would have to
rely on the returned fence pointer being NULL to detect errors. However,
the function vmw_execbuf_copy_fence_user() would expect a non-zero error
code in that case and would BUG otherwise.

So make sure we return a proper non-zero error code if the fence pointer
returned is NULL.

Cc: <stable@...r.kernel.org>
Fixes: ae2a104058e2: ("vmwgfx: Implement fence objects")
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Deepak Rawat <drawat@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3570,7 +3570,7 @@ int vmw_execbuf_fence_commands(struct dr
 		*p_fence = NULL;
 	}
 
-	return 0;
+	return ret;
 }
 
 /**