git: 48d6b52add36 - main - devfs: Return early from sysctl_devname() if no input is given

[Mark Johnston]

The branch main has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=48d6b52add36cc09e7fb1fbec44ab66c0742f320

commit 48d6b52add36cc09e7fb1fbec44ab66c0742f320
Author:     Mark Johnston <ma...@freebsd.org>
AuthorDate: 2025-03-20 01:34:10 +0000
Commit:     Mark Johnston <ma...@freebsd.org>
CommitDate: 2025-03-20 01:34:10 +0000

    devfs: Return early from sysctl_devname() if no input is given
    
    Otherwise we end up searching for a device using an uninitialized key,
    tripping up KMSAN.
    
    MFC after:      2 weeks
---
 sys/fs/devfs/devfs_devs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/fs/devfs/devfs_devs.c b/sys/fs/devfs/devfs_devs.c
index db879efe803a..c6dcd4fc7646 100644
--- a/sys/fs/devfs/devfs_devs.c
+++ b/sys/fs/devfs/devfs_devs.c
@@ -86,6 +86,9 @@ sysctl_devname(SYSCTL_HANDLER_ARGS)
        struct cdev_priv *cdp;
        struct cdev *dev;
 
+       if (req->newptr == NULL)
+               return (EINVAL);
+
 #ifdef COMPAT_FREEBSD11
        if (req->newlen == sizeof(ud_compat)) {
                error = SYSCTL_IN(req, &ud_compat, sizeof(ud_compat));