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devfs: Return early from sysctl_devname() if no input is given

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Otherwise we end up searching for a device using an uninitialized key,
tripping up KMSAN.

MFC after:	2 weeks

(cherry picked from commit 48d6b52add36cc09e7fb1fbec44ab66c0742f320)
This commit is contained in:
Mark Johnston 2025-03-20 01:34:10 +00:00
parent 8c991c4b06
commit 48fddba637
1 changed files with 3 additions and 0 deletions
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3
sys/fs/devfs/devfs_devs.c
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@ -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));