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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.
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commit 9875bb22212391e 39d9d2c29b4b5d5 e9e1f83beb
Author: Maxim Kuvyrkov <email address hidden>
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(-)