linux-kernel - [PATCH 3.18 45/50] drm/msm: Verify that MSM_SUBMIT_BO

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Message-Id: <20170804231553.808674119@linuxfoundation.org>
Date:   Fri,  4 Aug 2017 16:16:31 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...il.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 3.18 45/50] drm/msm: Verify that MSM_SUBMIT_BO_FLAGS are set

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

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

From: Jordan Crouse <jcrouse@...eaurora.org>


[ Upstream commit a6cb3b864b21b7345f824a4faa12b723c8aaf099 ]

For every submission buffer object one of MSM_SUBMIT_BO_WRITE
and MSM_SUBMIT_BO_READ must be set (and nothing else). If we
allowed zero then the buffer object would never get queued to
be unreferenced.

Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
Signed-off-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/msm/msm_gem_submit.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -90,7 +90,8 @@ static int submit_lookup_objects(struct
 			pagefault_disable();
 		}
 
-		if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) {
+		if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
+			!(submit_bo.flags & MSM_SUBMIT_BO_FLAGS)) {
 			DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
 			ret = -EINVAL;
 			goto out_unlock;