libdm: fix buffer overflow

diff --git a/libdm/libdm-common.c b/libdm/libdm-common.c
index 094e6185483b748fb4d28cf3bad58dd31352d2a1..40b366b989500288d9e8fdb16ff2565e95383796 100644 (file)
--- a/libdm/libdm-common.c
+++ b/libdm/libdm-common.c
@@ -1763,7 +1763,7 @@ static int _mountinfo_parse_line(const char *line, unsigned *maj, unsigned *min,
                        return 0;
                }
                devmapper += 12; /* skip fixed prefix */
-               for (i = 0; devmapper[i] && devmapper[i] != ' ' && i < sizeof(root); ++i)
+               for (i = 0; devmapper[i] && devmapper[i] != ' ' && i < sizeof(root)-1; ++i)
                        root[i] = devmapper[i];
                root[i] = 0;
                _unmangle_mountinfo_string(root, buf);