[Bug malloc/15073] Race condition using ATOMIC_FASTBINS in _int_free causes crash or heap corruption

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=15073

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       via  362b47fe09ca9a928d444c7e2f7992f7f61bfc3e (commit)
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=abc26e998f74750850cc02f9c249ee794cbdd8e8

commit abc26e998f74750850cc02f9c249ee794cbdd8e8
Author: Maxim Kuvyrkov <maxim@kugelworks.com>
Date:   Tue Dec 24 09:55:03 2013 +1300

    Restore accidentally deleted bug-fix entries in NEWS.

        * NEWS: Restore accidentally deleted bug-fix entries.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=362b47fe09ca9a928d444c7e2f7992f7f61bfc3e

commit 362b47fe09ca9a928d444c7e2f7992f7f61bfc3e
Author: Maxim Kuvyrkov <maxim@kugelworks.com>
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.

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

Summary of changes:
 ChangeLog       |   11 +++++++++++
 NEWS            |   23 ++++++++++++-----------
 malloc/malloc.c |   20 ++++++++++++--------
 3 files changed, 35 insertions(+), 19 deletions(-)

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