Avoid the possibility of accessing an array out of bounds.

Found with cppcheck. ok krw@

diff --git a/sbin/fsck_msdos/dir.c b/sbin/fsck_msdos/dir.c
index 5ab153d..7397e57 100644 (file)
--- a/sbin/fsck_msdos/dir.c
+++ b/sbin/fsck_msdos/dir.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: dir.c,v 1.30 2015/12/10 17:26:59 mmcc Exp $   */
+/*     $OpenBSD: dir.c,v 1.31 2017/06/27 12:10:21 jsg Exp $    */
 /*     $NetBSD: dir.c,v 1.11 1997/10/17 11:19:35 ws Exp $      */
 
 /*
@@ -593,6 +593,8 @@ readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
                        dirent.name[8] = '\0';
                        for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
                                dirent.name[k] = '\0';
+                       if (k < 0)
+                               k = 0;
                        if (dirent.name[k] != '\0')
                                k++;
                        if (dirent.name[0] == SLOT_E5)