[PATCH] ntsync: Check for owner in setup_wait()

[PATCH] ntsync: Check for owner in setup_wait()

[Griffin Kroah-Hartman]

Add a check to see if any mutex owner is 0.

As stated in the uapi documentation , this is a failure case that was
not being checked under the NTSYNC_IOC_WAIT_ANY and NTSYNC_IOC_WAIT_ALL
cases, which state that mutexes with no owner should fail the ioctl with
-EINVAL.

Assisted-by: gkh_clanker_t1000
Signed-off-by: Griffin Kroah-Hartman <griffin@kroah.com>
---
 drivers/misc/ntsync.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index 02c9d1192812..4a805919bb0c 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -875,6 +875,9 @@ static int setup_wait(struct ntsync_device *dev,
 	if (args->pad || (args->flags & ~NTSYNC_WAIT_REALTIME))
 		return -EINVAL;
 
+	if (!args->owner)
+		return -EINVAL;
+
 	if (size >= sizeof(fds))
 		return -EINVAL;
 

---
base-commit: a13c140cc289c0b7b3770bce5b3ad42ab35074aa
change-id: 20260714-ntsync_patches_1-34ea98de8606

Best regards,
--  
Griffin Kroah-Hartman <griffin@kroah.com>

Re: [PATCH] ntsync: Check for owner in setup_wait()

[Elizabeth Figura]

On Tuesday, 14 July 2026 10:36:46 CDT Griffin Kroah-Hartman wrote:
> Add a check to see if any mutex owner is 0.
> 
> As stated in the uapi documentation , this is a failure case that was
> not being checked under the NTSYNC_IOC_WAIT_ANY and NTSYNC_IOC_WAIT_ALL
> cases, which state that mutexes with no owner should fail the ioctl with
> -EINVAL.

This has already been sent I'm afraid:

https://lore.kernel.org/all/20260628024239.152852-1-ivanrwcm25@gmail.com/