[Bug libc/1349] New: malloc_usable_size() incorrect when MALLOC_CHECK_>0

["jkearney at endeca dot com" <sourceware-bugzilla at sourceware dot org>]

When MALLOC_CHECK_>0, an extra byte is added to each allocation for checking. 
malloc_usable_size() doesn't take this extra byte off the return value in this
case.  Try the following with MALLOC_CHECK_=2:

    void* p = malloc(7);
    size_t usable = malloc_usable_size(p);
    memset(p, 0, usable);
    p = realloc(p, 7);

-- 
           Summary: malloc_usable_size() incorrect when MALLOC_CHECK_>0
           Product: glibc
           Version: 2.3.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: jkearney at endeca dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=1349

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