linux-kernel - [PATCH 4.20 42/50] drm/vmwgfx: Fix an uninitialized fence handle value

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Date:   Wed, 13 Feb 2019 19:38:47 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Deepak Rawat <drawat@...are.com>,
        Brian Paul <brianp@...are.com>, Sinclair Yeh <syeh@...are.com>
Subject: [PATCH 4.20 42/50] drm/vmwgfx: Fix an uninitialized fence handle value

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

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

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

commit 51fdbeb4ca1a8415c98f87cb877956ae83e71627 upstream.

if vmw_execbuf_fence_commands() fails, The handle value will be
uninitialized and a bogus fence handle might be copied to user-space.

Cc: <stable@...r.kernel.org>
Fixes: 2724b2d54cda: ("drm/vmwgfx: Use new validation interface for the modesetting code v2")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Brian Paul <brianp@...are.com> #v1
Reviewed-by: Sinclair Yeh <syeh@...are.com> #v1
Reviewed-by: Deepak Rawat <drawat@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -2592,8 +2592,8 @@ void vmw_kms_helper_validation_finish(st
 				      user_fence_rep)
 {
 	struct vmw_fence_obj *fence = NULL;
-	uint32_t handle;
-	int ret;
+	uint32_t handle = 0;
+	int ret = 0;
 
 	if (file_priv || user_fence_rep || vmw_validation_has_bos(ctx) ||
 	    out_fence)