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GNU C Library master sources branch release/2.16/master updated. glibc-2.16.0-12-gbbe53ed
- From: hjl at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 26 Sep 2012 18:32:15 -0000
- Subject: GNU C Library master sources branch release/2.16/master updated. glibc-2.16.0-12-gbbe53ed
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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=bbe53ed2c311b7281837b6f3f24ddeb8f3d65697
commit bbe53ed2c311b7281837b6f3f24ddeb8f3d65697
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Sep 24 08:58:04 2012 -0700
Properly handle fencepost with MALLOC_ALIGN_MASK
Cherry-pick commit ced6f16ee919d12725840d43d007f1cfd67118df.
Conflicts:
ChangeLog
NEWS
diff --git a/ChangeLog b/ChangeLog
index 5e818a9..967ab9b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-09-24 H.J. Lu <hongjiu.lu@intel.com>
+
+ [BZ #14562]
+ * malloc/arena.c (heap_trim): Properly get fencepost and adjust
+ new chunk size with MALLOC_ALIGN_MASK.
+
2012-08-29 H.J. Lu <hongjiu.lu@intel.com>
[BZ #14476]
diff --git a/NEWS b/NEWS
index ecb9350..4b10c01 100644
--- a/NEWS
+++ b/NEWS
@@ -9,7 +9,7 @@ Version 2.16.1
* The following bugs are resolved with this release:
- 14195, 14459, 14476
+ 14195, 14459, 14476, 14562
Version 2.16
diff --git a/malloc/arena.c b/malloc/arena.c
index 33c4ff3..71a0dee 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -652,15 +652,19 @@ heap_trim(heap_info *heap, size_t pad)
unsigned long pagesz = GLRO(dl_pagesize);
mchunkptr top_chunk = top(ar_ptr), p, bck, fwd;
heap_info *prev_heap;
- long new_size, top_size, extra;
+ long new_size, top_size, extra, prev_size, misalign;
/* Can this heap go away completely? */
while(top_chunk == chunk_at_offset(heap, sizeof(*heap))) {
prev_heap = heap->prev;
- p = chunk_at_offset(prev_heap, prev_heap->size - (MINSIZE-2*SIZE_SZ));
+ prev_size = prev_heap->size - (MINSIZE-2*SIZE_SZ);
+ p = chunk_at_offset(prev_heap, prev_size);
+ /* fencepost must be properly aligned. */
+ misalign = ((long) p) & MALLOC_ALIGN_MASK;
+ p = chunk_at_offset(prev_heap, prev_size - misalign);
assert(p->size == (0|PREV_INUSE)); /* must be fencepost */
p = prev_chunk(p);
- new_size = chunksize(p) + (MINSIZE-2*SIZE_SZ);
+ new_size = chunksize(p) + (MINSIZE-2*SIZE_SZ) + misalign;
assert(new_size>0 && new_size<(long)(2*MINSIZE));
if(!prev_inuse(p))
new_size += p->prev_size;
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 ++++++
NEWS | 2 +-
malloc/arena.c | 10 +++++++---
3 files changed, 14 insertions(+), 4 deletions(-)
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