https://github.com/torvalds/linux
This fixes a futex key reference count bug in futex_lock_pi(), where a key's reference count is incremented twice but decremented only once, causing the backing object to not be released. If the futex is created in a temporary file in an ext3 file system, this bug causes the file's inode to become an "undead" orphan, which causes an oops from a BUG_ON() in ext3_put_super() when the file system is unmounted. glibc's test suite is known to trigger this, see <http://bugzilla.kernel.org/show_bug.cgi?id=14256>. The bug is a regression from 2.6.28-git3, namely Peter Zijlstra's 38d47c1b7075bd7ec3881141bb3629da58f88dab "[PATCH] futex: rely on get_user_pages() for shared futexes". That commit made get_futex_key() also increment the reference count of the futex key, and updated its callers to decrement the key's reference count before returning. Unfortunately the normal exit path in futex_lock_pi() wasn't corrected: the reference count is incremented by get_futex_key() and queue_lock(), but the normal exit path only decrements once, via unqueue_me_pi(). The fix is to put_futex_key() after unqueue_me_pi(), since 2.6.31 this is easily done by 'goto out_put_key' rather than 'goto out'. Signed-off-by: Mikael Pettersson <mikpe@it.uu.se> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Darren Hart <dvhltc@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org>
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futex_lock_pi() key refcnt fix
File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 1.1 KB |
Makefile | -rw-r--r-- | 128 bytes |
patchlevel | -rw-r--r-- | 6 bytes |
wanmain.c | -rw-r--r-- | 19.1 KB |
wanproc.c | -rw-r--r-- | 9.1 KB |
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Computing file changes ...