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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.
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, release/2.17/master has been updated 402827d5b84774f a4487f6cd4 (commit) d62c03b2b3ba526 b468758702 (commit)
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- Log ------- ------- ------- ------- ------- ------- ------- ------- ------- -- /sourceware. org/git/ gitweb. cgi?p=glibc. git;h=3db0119ef 56decc402827d5b 84774fa4487f6cd 4
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commit 3db0119ef56decc 402827d5b84774f a4487f6cd4
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(-)