From: Aldy Hernandez <aldyh@redhat.com>
Date: Tue, 6 Oct 2020 06:21:56 +0000 (+0200)
Subject: Fix off-by-one storage problem in irange_allocator.
X-Git-Tag: basepoints/gcc-12~4587
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=952adf021889b5e055085d0ed63942ff97d913de;p=thirdparty%2Fgcc.git

Fix off-by-one storage problem in irange_allocator.

gcc/ChangeLog:

	* value-range.h (irange_allocator::allocate): Increase
	newir storage by one.
---

diff --git a/gcc/value-range.h b/gcc/value-range.h
index 94b48e55e778..7031a8231383 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -670,7 +670,7 @@ irange_allocator::allocate (unsigned num_pairs)
 
   struct newir {
     irange range;
-    tree mem[1];
+    tree mem[2];
   };
   size_t nbytes = (sizeof (newir) + sizeof (tree) * 2 * (num_pairs - 1));
   struct newir *r = (newir *) obstack_alloc (&m_obstack, nbytes);