diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2012-09-24 08:58:04 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2012-09-26 11:31:00 -0700 |
| commit | bbe53ed2c311b7281837b6f3f24ddeb8f3d65697 (patch) | |
| tree | 3b321694ae00355ab6a445774003fa9606c49f20 | |
| parent | 5b489807f7c8902901b42451883f3d5c89616a8a (diff) | |
| download | glibc-bbe53ed2c311b7281837b6f3f24ddeb8f3d65697.zip glibc-bbe53ed2c311b7281837b6f3f24ddeb8f3d65697.tar.gz glibc-bbe53ed2c311b7281837b6f3f24ddeb8f3d65697.tar.bz2 | |
Properly handle fencepost with MALLOC_ALIGN_MASK
Cherry-pick commit ced6f16ee919d12725840d43d007f1cfd67118df.
Conflicts:
ChangeLog
NEWS
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | malloc/arena.c | 10 |
3 files changed, 14 insertions, 4 deletions
@@ -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] @@ -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; |