From: fweimer@redhat.com (Florian Weimer)
To: libc-alpha@sourceware.org
Subject: [PATCH] sysmalloc: Initialize previous size field of mmaped chunks
Date: Fri, 28 Oct 2016 13:04:00 -0000 [thread overview]
Message-ID: <20161028130449.BB0E9439942E0@oldenburg.str.redhat.com> (raw)
With different encodings of the header, the previous zero initialization
may be insufficient and produce an invalid encoding.
2016-10-27 Florian Weimer <fweimer@redhat.com>
* malloc/malloc.c (sysmalloc): Initialize previous size field of
mmaped chunks.
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 186e174..72d22bd 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2306,6 +2306,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
else
{
p = (mchunkptr) mm;
+ set_prev_size (p, 0);
set_head (p, size | IS_MMAPPED);
}
next reply other threads:[~2016-10-28 13:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-28 13:04 Florian Weimer [this message]
2016-10-28 14:13 ` Carlos O'Donell
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