From 6856975ed4ce79355752d08938f066f2ed9fcfb5 Mon Sep 17 00:00:00 2001
From: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Thu, 22 Jul 2021 18:38:16 +0530
Subject: mcheck Fix malloc_usable_size [BZ #22057]

Interpose malloc_usable_size to return the correct mcheck value for
malloc_usable_size.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
---
 malloc/mcheck-impl.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'malloc/mcheck-impl.c')

diff --git a/malloc/mcheck-impl.c b/malloc/mcheck-impl.c
index 8857e6b179..6597a290a6 100644
--- a/malloc/mcheck-impl.c
+++ b/malloc/mcheck-impl.c
@@ -404,3 +404,9 @@ __mcheck_initialize (void (*func) (enum mcheck_status), bool in_pedantic)
   pedantic = in_pedantic;
   return 0;
 }
+
+static int
+mcheck_usable_size (struct hdr *h)
+{
+  return (h - 1)->size;
+}
-- 
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