* path.cc (chdir): Avoid trailing dot calculation when chdir == '/' or we endunlabeled-1.39.2

up with an empty string.

1 files changed, 2 insertions, 3 deletions

diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index a46ac4f41..4c6e1f715 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -2601,8 +2601,7 @@ getwd (char *buf)
 }
 
 /* chdir: POSIX 5.2.1.1 */
-extern "C"
-int
+extern "C" int
 chdir (const char *dir)
 {
   syscall_printf ("dir %s", dir);
@@ -2642,7 +2641,7 @@ chdir (const char *dir)
          of dots > 2 here instead of returning an error code.  Counts of dots
          <= 2 are already eliminated by normalize_posix_path. */
       char *last_slash = strrchr (pathbuf, '/');
-      if (last_slash && strspn (last_slash + 1, ".") == strlen (last_slash + 1))
+      if (last_slash > pathbuf && strspn (last_slash + 1, ".") == strlen (last_slash + 1))
         *last_slash = '\0';
       free (cwd_posix);
       cwd_posix = strdup (pathbuf);