Fix off by one when checking "/dev/mapper/" path

This PR fixes an off by one in `strncmp(dev->bid_name, "/dev/mapper/", 11)` check. The `"/dev/mapper/"` string literal has a length of 12 and without this fix paths like `"/dev/mapperSOMETHING"` would also be accepted.

diff --git a/libblkid/src/devname.c b/libblkid/src/devname.c
index 014b3f490bf948a563b1931eb429f80a2fb9d794..bb0211da403b23f554d55a556d6dd42693d89eba 100644 (file)
--- a/libblkid/src/devname.c
+++ b/libblkid/src/devname.c
@@ -258,7 +258,7 @@ set_pri:
        if (dev) {
                if (pri)
                        dev->bid_pri = pri;
-               else if (!strncmp(dev->bid_name, "/dev/mapper/", 11)) {
+               else if (!strncmp(dev->bid_name, "/dev/mapper/", 12)) {
                        dev->bid_pri = BLKID_PRI_DM;
                        if (is_dm_leaf(ptname))
                                dev->bid_pri += 5;