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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9875bb22212391e39d9d2c29b4b5d5e9e1f83beb
commit 9875bb22212391e39d9d2c29b4b5d5e9e1f83beb
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.
Conflicts:
ChangeLog
NEWS
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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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