git: 288a4784012c - stable/13 - pidfile test: guarantee nul termination of the read pid string

[Konstantin Belousov]

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=288a4784012ca3f2b2c2cb46e67d9c65cd55b5e0

commit 288a4784012ca3f2b2c2cb46e67d9c65cd55b5e0
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-09-24 03:12:20 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-10-01 00:32:22 +0000

    pidfile test: guarantee nul termination of the read pid string
    
    PR:     258701
    
    (cherry picked from commit 364790beafec707ca3e334683e4030684d829be2)
---
 lib/libutil/tests/pidfile_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/libutil/tests/pidfile_test.c b/lib/libutil/tests/pidfile_test.c
index 9e516c35273c..9bfa6754ce54 100644
--- a/lib/libutil/tests/pidfile_test.c
+++ b/lib/libutil/tests/pidfile_test.c
@@ -286,7 +286,8 @@ test_pidfile_relative(void)
 	fd = open(path, O_RDONLY);
 	if (fd < 0)
 		return (strerror(errno));
-	if (read(fd, pid, sizeof(pid)) < 0)
+	memset(pid, 0, sizeof(pid));
+	if (read(fd, pid, sizeof(pid) - 1) < 0)
 		return (strerror(errno));
 	if (atoi(pid) != getpid())
 		return ("pid mismatch");