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-rw-r--r--ChangeLog6
-rw-r--r--NEWS4
-rw-r--r--posix/glob.c4
3 files changed, 12 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 01a1e99d83..77eea1e024 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-10-22  Paul Eggert <eggert@cs.ucla.edu>
+
+	[BZ #22332]
+	* posix/glob.c (__glob): Fix buffer overflow during GLOB_TILDE
+	unescaping.
+
 2017-10-21  Florian Weimer  <fweimer@redhat.com>
 
 	* posix/Makefile (tests): Add tst-glob-tilde.
diff --git a/NEWS b/NEWS
index a70d21eb40..0531dfa9c6 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,10 @@ Security related changes:
   processing, leading to a memory leak and, potentially, to a denial
   of service.
 
+* The glob function, when invoked with GLOB_TILDE and without
+  GLOB_NOESCAPE, could write past the end of a buffer while
+  unescaping user names.  Reported by Tim Rühsen.
+
 The following bugs are resolved with this release:
 
   [20790] Fix rpcgen buffer overrun
diff --git a/posix/glob.c b/posix/glob.c
index 026bc063d3..f3fa807700 100644
--- a/posix/glob.c
+++ b/posix/glob.c
@@ -863,11 +863,11 @@ glob (const char *pattern, int flags, int (*errfunc) (const char *, int),
 		  char *p = mempcpy (newp, dirname + 1,
 				     unescape - dirname - 1);
 		  char *q = unescape;
-		  while (*q != '\0')
+		  while (q != end_name)
 		    {
 		      if (*q == '\\')
 			{
-			  if (q[1] == '\0')
+			  if (q + 1 == end_name)
 			    {
 			      /* "~fo\\o\\" unescape to user_name "foo\\",
 				 but "~fo\\o\\/" unescape to user_name