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-rw-r--r--src/shared/utmp-wtmp.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/shared/utmp-wtmp.c b/src/shared/utmp-wtmp.c
index 046fb584fb..8717dbac2d 100644
--- a/src/shared/utmp-wtmp.c
+++ b/src/shared/utmp-wtmp.c
@@ -403,10 +403,12 @@ int utmp_wall(const char *message, bool (*match_tty)(const char *tty)) {
if (u->ut_type != USER_PROCESS || u->ut_user[0] == 0)
continue;
+ /* this access is fine, because strlen("/dev/") << 32 (UT_LINESIZE) */
if (path_startswith(u->ut_line, "/dev/"))
path = u->ut_line;
else {
- if (asprintf(&buf, "/dev/%s", u->ut_line) < 0) {
+ if (asprintf(&buf, "/dev/%.*s",
+ sizeof(u->ut_line), u->ut_line) < 0) {
r = -ENOMEM;
goto finish;
}