git: 9ad2d4c4907d - main - Fix pjfstest issue tests/rename/19.t

The branch main has been updated by fsu:

URL: https://cgit.FreeBSD.org/src/commit/?id=9ad2d4c4907da9c9edd4826219f6fa08544d31c4

commit 9ad2d4c4907da9c9edd4826219f6fa08544d31c4
Author:     Fedor Uporov <fsu@FreeBSD.org>
AuthorDate: 2023-01-26 10:17:48 +0000
Commit:     Fedor Uporov <fsu@FreeBSD.org>
CommitDate: 2023-01-29 08:11:23 +0000

    Fix pjfstest issue tests/rename/19.t
    
    The rename call with args like:
    "./dir0/dir1/.." "./dir2" will cause MPASS failure.
    The tmpfs_dir_lookup() does not accept names like
    '.' and '..' for lookup. Move the '.' and '..' entry
    check before tmpfs_dir_lookup() call.
    
    Reviewed by:    kib
    MFC after:      2 week
    Differential revision:  https://reviews.freebsd.org/D38051
---
 sys/fs/tmpfs/tmpfs_vnops.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c
index 1e3a4ac68f3f..da934338948b 100644
--- a/sys/fs/tmpfs/tmpfs_vnops.c
+++ b/sys/fs/tmpfs/tmpfs_vnops.c
@@ -1029,6 +1029,15 @@ tmpfs_rename(struct vop_rename_args *v)
 		}
 	}
 
+	/*
+	 * Avoid manipulating '.' and '..' entries.
+	 */
+	if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
+	    (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) {
+		error = EINVAL;
+		goto out_locked;
+	}
+
 	if (tvp != NULL)
 		vn_seqc_write_begin(tvp);
 	vn_seqc_write_begin(tdvp);
@@ -1044,8 +1053,7 @@ tmpfs_rename(struct vop_rename_args *v)
 	de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
 
 	/*
-	 * Entry can disappear before we lock fdvp,
-	 * also avoid manipulating '.' and '..' entries.
+	 * Entry can disappear before we lock fdvp.
 	 */
 	if (de == NULL) {
 		if ((fcnp->cn_flags & ISDOTDOT) != 0 ||