From 04f915037850166c05c73baf3d6e2ba10c790ea1 Mon Sep 17 00:00:00 2001
From: Markus Trippelsdorf <markus@trippelsdorf.de>
Date: Mon, 27 Nov 2017 12:53:16 +0000
Subject: [PATCH] Fix UB in hash-map.h
bootstrap-ubsan shows:
gcc/hash-map.h:277:19: runtime error: member access within null pointer of type 'struct hash_map'
Fix the issue by returning early.
From-SVN: r255166
---
gcc/ChangeLog | 4 ++++
gcc/hash-map.h | 3 ++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a7066fb7ad19..98e49cdb9c0f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2017-11-27 Markus Trippelsdorf <markus@trippelsdorf.de>
+
+ * hash-map.h (gt_cleare_cache): Avoid UB.
+
2017-11-27 Eric Botcazou <ebotcazou@adacore.com>
* cfgloop.h (struct loop): Document usage of USHRT_MAX for unroll.
diff --git a/gcc/hash-map.h b/gcc/hash-map.h
index 6b8365a9d0a6..10ae52d194ad 100644
--- a/gcc/hash-map.h
+++ b/gcc/hash-map.h
@@ -274,7 +274,8 @@ template<typename K, typename V, typename H>
static inline void
gt_cleare_cache (hash_map<K, V, H> *h)
{
- gt_cleare_cache (&h->m_table);
+ if (h)
+ gt_cleare_cache (&h->m_table);
}
template<typename K, typename V, typename H>
--
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