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

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #12 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, 2.15 has been created
        at  9875bb22212391e39d9d2c29b4b5d5e9e1f83beb (commit)

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9875bb22212391e39d9d2c29b4b5d5e9e1f83beb

commit 9875bb22212391e39d9d2c29b4b5d5e9e1f83beb
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.

    Conflicts:

        ChangeLog
        NEWS

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

-- 
You are receiving this mail because:
You are on the CC list for the bug.