Comment 27 for bug 1020210

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8b43a2274a593ce91e673db1cfac6e808134bc84

commit 8b43a2274a593ce91e673db1cfac6e808134bc84
Author: Maxim Kuvyrkov <email address hidden>
Date: Tue Dec 24 09:44:50 2013 +1300

    Fix race in free() of fastbin chunk: BZ #15073

    Perform sanity check only if we have_lock. Due to lockless nature of fastbins
    we need to be careful derefencing pointers to fastbin entries (chunksize(old)
    in this case) in multithreaded environments.

    The fix is to add have_lock to the if-condition checks. The rest of the patch
    only makes code more readable.

     * malloc/malloc.c (_int_free): Perform sanity check only if we
     have_lock.

    Conflicts:

     ChangeLog
     NEWS

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog | 7 +++++++
 NEWS | 2 +-
 malloc/malloc.c | 20 ++++++++++++--------
 3 files changed, 20 insertions(+), 9 deletions(-)