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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c972bcc9ebdb5c2601b6b34001c7450e7a0b5ea3
commit c972bcc9ebdb5c2601b6b34001c7450e7a0b5ea3
Author: Maxim Kuvyrkov <ma...@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
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 7 +++++++
NEWS | 2 +-
malloc/malloc.c | 20 ++++++++++++--------
3 files changed, 20 insertions(+), 9 deletions(-)
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https://bugs.launchpad.net/bugs/1020210
Title:
Race condition using ATOMIC_FASTBINS in _int_free causes crash or heap
corruption
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