git: 4b32fdb4a614 - main - lindebugfs: check that name is set as otherwise pfs_alloc_node_flags() panics

The branch main has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=4b32fdb4a614de602d288ac5a414cb43e9f2163e

commit 4b32fdb4a614de602d288ac5a414cb43e9f2163e
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2026-01-29 11:16:50 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2026-01-29 19:35:23 +0000

    lindebugfs: check that name is set as otherwise pfs_alloc_node_flags() panics
    
    I have hit the case multiple times that some LinuxKPI field may not be
    set during driver bringup and lindebugfs would cause a panic.
    The backtrace goes like:
    
      strlen() at strlen+0x54
      pfs_create_dir() at pfs_create_dir+0x41
      debugfs_create_dir() at debugfs_create_dir+0xa1
      ...
    
    While the problem is clearly in LinuxKPI or the driver, we likely
    should at least add an assert to pfs_create_dir() if name is NULL
    like we have for pfs_add_node() but for lindebugfs at least make
    this a graceful error and continue without creating the dir instead
    of panicing.
    
    Sponsored by:   The FreeBSD Foundation
    MFC after:      3 days
    Reviewed by:    kevans
    Differential Revision: https://reviews.freebsd.org/D54944
---
 sys/compat/lindebugfs/lindebugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/compat/lindebugfs/lindebugfs.c b/sys/compat/lindebugfs/lindebugfs.c
index 8cddc6f390bc..857546f61e55 100644
--- a/sys/compat/lindebugfs/lindebugfs.c
+++ b/sys/compat/lindebugfs/lindebugfs.c
@@ -272,6 +272,9 @@ debugfs_create_dir(const char *name, struct dentry *parent)
 	struct dentry *dnode;
 	struct pfs_node *pnode;
 
+	if (name == NULL)
+		return (NULL);
+
 	dm = malloc(sizeof(*dm), M_DFSINT, M_NOWAIT | M_ZERO);
 	if (dm == NULL)
 		return (NULL);