git: 9460df357344 - stable/14 - fts(3): be less strict when automount does its job under us walking autofs mount

The branch stable/14 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=9460df357344a2848f9cab07a5228cd9615800e1

commit 9460df357344a2848f9cab07a5228cd9615800e1
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2025-02-21 13:07:43 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2025-03-04 04:19:08 +0000

    fts(3): be less strict when automount does its job under us walking autofs mount
    
    PR:     284914
    
    (cherry picked from commit e59991206b1463b7e85cc8aafde7f1dc03fcedcf)
---
 lib/libc/gen/fts.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/lib/libc/gen/fts.c b/lib/libc/gen/fts.c
index ff51d2b224c2..a718c4e1e85c 100644
--- a/lib/libc/gen/fts.c
+++ b/lib/libc/gen/fts.c
@@ -1145,6 +1145,7 @@ fts_safe_changedir(FTS *sp, FTSENT *p, int fd, char *path)
 {
 	int ret, oerrno, newfd;
 	struct stat sb;
+	struct statfs sf;
 
 	newfd = fd;
 	if (ISSET(FTS_NOCHDIR))
@@ -1157,9 +1158,15 @@ fts_safe_changedir(FTS *sp, FTSENT *p, int fd, char *path)
 		goto bail;
 	}
 	if (p->fts_dev != sb.st_dev || p->fts_ino != sb.st_ino) {
-		errno = ENOENT;		/* disinformation */
-		ret = -1;
-		goto bail;
+		if (_fstatfs(newfd, &sf) != 0 ||
+		    (sf.f_flags & MNT_AUTOMOUNTED) == 0) {
+			errno = ENOENT;		/* disinformation */
+			ret = -1;
+			goto bail;
+		}
+		/* autofs might did the mount under us, accept. */
+		p->fts_dev = sb.st_dev;
+		p->fts_ino == sb.st_ino;
 	}
 	ret = fchdir(newfd);
 bail: