linux-kernel - [PATCH 2/2] drm/msm: Defer fd_install in VM

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Message-ID: <20250723202825.18902-3-robin.clark@oss.qualcomm.com>
Date: Wed, 23 Jul 2025 13:28:23 -0700
From: Rob Clark <robin.clark@....qualcomm.com>
To: dri-devel@...ts.freedesktop.org
Cc: linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] drm/msm: Defer fd_install in VM_BIND ioctl

Avoid fd_install() until there are no more potential error paths, to
avoid put_unused_fd() after the fd is made visible to userspace.

Fixes: 03b6becb03c8 ("Merge tag 'drm-msm-next-2025-07-05' into HEAD")
Signed-off-by: Rob Clark <robin.clark@....qualcomm.com>
---
 drivers/gpu/drm/msm/msm_gem_vma.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index e5162db436a6..d4b1cfb3aa03 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -1473,12 +1473,8 @@ msm_ioctl_vm_bind(struct drm_device *dev, void *data, struct drm_file *file)
 
 	if (args->flags & MSM_VM_BIND_FENCE_FD_OUT) {
 		sync_file = sync_file_create(job->fence);
-		if (!sync_file) {
+		if (!sync_file)
 			ret = -ENOMEM;
-		} else {
-			fd_install(out_fence_fd, sync_file->file);
-			args->fence_fd = out_fence_fd;
-		}
 	}
 
 	if (ret)
@@ -1507,10 +1503,14 @@ msm_ioctl_vm_bind(struct drm_device *dev, void *data, struct drm_file *file)
 out_unlock:
 	mutex_unlock(&queue->lock);
 out_post_unlock:
-	if (ret && (out_fence_fd >= 0)) {
-		put_unused_fd(out_fence_fd);
+	if (ret) {
+		if (out_fence_fd >= 0)
+			put_unused_fd(out_fence_fd);
 		if (sync_file)
 			fput(sync_file->file);
+	} else if (sync_file) {
+		fd_install(out_fence_fd, sync_file->file);
+		args->fence_fd = out_fence_fd;
 	}
 
 	if (!IS_ERR_OR_NULL(job)) {
-- 
2.50.1