From 2f5c1750558fe64bac361f52d6827ab1bcfe52bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20B=C3=ADlka?= <neleai@seznam.cz>
Date: Sat, 11 Jul 2015 17:44:10 +0200
Subject: [PATCH] Handle overflow in __hcreate_r

Hi,

As in bugzilla entry there is overflow in hsearch when looking for prime
number as SIZE_MAX - 1 is divisible by 5. We fix that by rejecting large
inputs before looking for prime.

	* misc/hsearch_r.c (__hcreate_r): Handle overflow.
---
 ChangeLog        | 10 ++++++++++
 misc/hsearch_r.c |  9 ++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

#diff --git a/ChangeLog b/ChangeLog
#index 0dfa3b3..73645c3 100644
#--- a/ChangeLog
#+++ b/ChangeLog
#@@ -1,3 +1,13 @@
#+2015-08-25  Ondřej Bílka  <neleai@seznam.cz>
#+
#+	* debug/strcpy_chk.c: Improve performance.
#+	* debug/stpcpy_chk.c: Likewise.
#+	* sysdeps/x86_64/strcpy_chk.S: Remove.
#+	* sysdeps/x86_64/stpcpy_chk.S: Remove.
#+
#+	[BZ #18240]
#+	* misc/hsearch_r.c (__hcreate_r): Handle overflow.
#+
# 2015-08-25  H.J. Lu  <hongjiu.lu@intel.com>
# 
# 	[BZ #15128]
diff --git a/misc/hsearch_r.c b/misc/hsearch_r.c
index 9f55e84..559df29 100644
--- a/misc/hsearch_r.c
+++ b/misc/hsearch_r.c
@@ -19,7 +19,7 @@
 #include <errno.h>
 #include <malloc.h>
 #include <string.h>
-
+#include <stdint.h>
 #include <search.h>
 
 /* [Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986
@@ -73,6 +73,13 @@ __hcreate_r (nel, htab)
       return 0;
     }
 
+  if (nel >= SIZE_MAX / sizeof (_ENTRY))
+    {
+      __set_errno (ENOMEM);
+      return 0;
+    }
+
+
   /* There is still another table active. Return with error. */
   if (htab->table != NULL)
     return 0;
-- 
2.7.1