git: 4d1134a54c85 - stable/13 - fstatat(2): restore AT_EMPTY_PATH handling

The branch stable/13 has been updated by dchagin:

URL: https://cgit.FreeBSD.org/src/commit/?id=4d1134a54c85ae8926eb43b7e51aee6e65b71816

commit 4d1134a54c85ae8926eb43b7e51aee6e65b71816
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2023-05-02 15:11:39 +0000
Commit:     Dmitry Chagin <dchagin@FreeBSD.org>
CommitDate: 2023-06-29 08:15:50 +0000

    fstatat(2): restore AT_EMPTY_PATH handling
    
    Fixes:  cb858340dcbf214cc4c4d78dbb741620d7b3a252
    Reported by:    markj
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit a1d71cebc05ccfeedf95f2db3e94b17270167888)
---
 sys/kern/vfs_syscalls.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 89f45e898d8e..7f7836450811 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -2432,8 +2432,12 @@ kern_statat(struct thread *td, int flag, int fd, const char *path,
 	    AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) | LOCKSHARED | LOCKLEAF |
 	    AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, td);
 
-	if ((error = namei(&nd)) != 0)
+	if ((error = namei(&nd)) != 0) {
+		if (error == ENOTDIR &&
+		    (nd.ni_resflags & NIRES_EMPTYPATH) != 0)
+			error = kern_fstat(td, fd, sbp);
 		return (error);
+	}
 	error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED, td);
 	NDFREE_NOTHING(&nd);
 	vput(nd.ni_vp);