git: 67218bcea847 - main - kern___realpathat(): do not copyout past end of string

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=67218bcea847c93ccd002335748884b02a3ca807

commit 67218bcea847c93ccd002335748884b02a3ca807
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2024-11-25 12:41:46 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2024-11-25 19:36:41 +0000

    kern___realpathat(): do not copyout past end of string
    
    Reported and tested by: pho
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D47739
---
 sys/kern/vfs_cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index c4b4d59f3b40..f7178ee006ea 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -3290,7 +3290,7 @@ kern___realpathat(struct thread *td, int fd, const char *path, char *buf,
 		    &freebuf, &size);
 	}
 	if (error == 0) {
-		error = copyout(retbuf, buf, size);
+		error = copyout(retbuf, buf, min(strlen(retbuf) + 1, size));
 		free(freebuf, M_TEMP);
 	}
 out: