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From: Dan Carpenter <dan.carpenter@oracle.com>
To: David Airlie <airlied@linux.ie>,
	Gurchetan Singh <gurchetansingh@chromium.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>, Chia-I Wu <olvaffe@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	dri-devel@lists.freedesktop.org,
	virtualization@lists.linux-foundation.org,
	kernel-janitors@vger.kernel.org
Subject: [PATCH] virtio-gpu: fix shift wrapping bug in virtio_gpu_fence_event_create()
Date: Thu, 15 Sep 2022 14:14:14 +0300	[thread overview]
Message-ID: <YyMJBkId0c1lvrrO@kili> (raw)

The ->ring_idx_mask variable is a u64 so static checkers, Smatch in
this case, complain if the BIT() is not also a u64.

drivers/gpu/drm/virtio/virtgpu_ioctl.c:50 virtio_gpu_fence_event_create()
warn: should '(1 << ring_idx)' be a 64 bit type?

Fixes: cd7f5ca33585 ("drm/virtio: implement context init: add virtio_gpu_fence_event")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 3b1701607aae..14eedb75f8a8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -47,7 +47,7 @@ static int virtio_gpu_fence_event_create(struct drm_device *dev,
 	struct virtio_gpu_fence_event *e = NULL;
 	int ret;
 
-	if (!(vfpriv->ring_idx_mask & (1 << ring_idx)))
+	if (!(vfpriv->ring_idx_mask & (1ULL << ring_idx)))
 		return 0;
 
 	e = kzalloc(sizeof(*e), GFP_KERNEL);
-- 
2.35.1


WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: David Airlie <airlied@linux.ie>,
	Gurchetan Singh <gurchetansingh@chromium.org>
Cc: kernel-janitors@vger.kernel.org, dri-devel@lists.freedesktop.org,
	virtualization@lists.linux-foundation.org,
	Daniel Vetter <daniel@ffwll.ch>, Chia-I Wu <olvaffe@gmail.com>
Subject: [PATCH] virtio-gpu: fix shift wrapping bug in virtio_gpu_fence_event_create()
Date: Thu, 15 Sep 2022 14:14:14 +0300	[thread overview]
Message-ID: <YyMJBkId0c1lvrrO@kili> (raw)

The ->ring_idx_mask variable is a u64 so static checkers, Smatch in
this case, complain if the BIT() is not also a u64.

drivers/gpu/drm/virtio/virtgpu_ioctl.c:50 virtio_gpu_fence_event_create()
warn: should '(1 << ring_idx)' be a 64 bit type?

Fixes: cd7f5ca33585 ("drm/virtio: implement context init: add virtio_gpu_fence_event")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 3b1701607aae..14eedb75f8a8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -47,7 +47,7 @@ static int virtio_gpu_fence_event_create(struct drm_device *dev,
 	struct virtio_gpu_fence_event *e = NULL;
 	int ret;
 
-	if (!(vfpriv->ring_idx_mask & (1 << ring_idx)))
+	if (!(vfpriv->ring_idx_mask & (1ULL << ring_idx)))
 		return 0;
 
 	e = kzalloc(sizeof(*e), GFP_KERNEL);
-- 
2.35.1

_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: David Airlie <airlied@linux.ie>,
	Gurchetan Singh <gurchetansingh@chromium.org>
Cc: kernel-janitors@vger.kernel.org, dri-devel@lists.freedesktop.org,
	virtualization@lists.linux-foundation.org,
	Gerd Hoffmann <kraxel@redhat.com>
Subject: [PATCH] virtio-gpu: fix shift wrapping bug in virtio_gpu_fence_event_create()
Date: Thu, 15 Sep 2022 14:14:14 +0300	[thread overview]
Message-ID: <YyMJBkId0c1lvrrO@kili> (raw)

The ->ring_idx_mask variable is a u64 so static checkers, Smatch in
this case, complain if the BIT() is not also a u64.

drivers/gpu/drm/virtio/virtgpu_ioctl.c:50 virtio_gpu_fence_event_create()
warn: should '(1 << ring_idx)' be a 64 bit type?

Fixes: cd7f5ca33585 ("drm/virtio: implement context init: add virtio_gpu_fence_event")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 3b1701607aae..14eedb75f8a8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -47,7 +47,7 @@ static int virtio_gpu_fence_event_create(struct drm_device *dev,
 	struct virtio_gpu_fence_event *e = NULL;
 	int ret;
 
-	if (!(vfpriv->ring_idx_mask & (1 << ring_idx)))
+	if (!(vfpriv->ring_idx_mask & (1ULL << ring_idx)))
 		return 0;
 
 	e = kzalloc(sizeof(*e), GFP_KERNEL);
-- 
2.35.1


             reply	other threads:[~2022-09-15 11:14 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-15 11:14 Dan Carpenter [this message]
2022-09-15 11:14 ` [PATCH] virtio-gpu: fix shift wrapping bug in virtio_gpu_fence_event_create() Dan Carpenter
2022-09-15 11:14 ` Dan Carpenter
2022-09-16  0:45 ` Chia-I Wu
2022-09-16  0:45   ` Chia-I Wu
2022-09-16  0:45   ` Chia-I Wu
2022-09-16  5:24   ` Dan Carpenter
2022-09-16  5:24     ` Dan Carpenter
2022-09-16  5:24     ` Dan Carpenter

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