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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 <[email protected]>
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 <[email protected]>
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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https://bugs.launchpad.net/bugs/1020210
Title:
Race condition using ATOMIC_FASTBINS in _int_free causes crash or heap
corruption
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