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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-31 02:30:55 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:56 -0800
commit993dfa8776308dcfd311cf77a3bbed4aa11e9868 (patch)
tree2e90eabd31d3e8db1f2f3c95494109ff29a78237 /Documentation/laptop-mode.txt
parent7a2bd3f7efa86e8b56482a8f8948c8b222064a67 (diff)
[PATCH] fs/locks.c: Fix sys_flock() race
sys_flock() currently has a race which can result in a double free in the multi-thread case. Thread 1 Thread 2 sys_flock(file, LOCK_EX) sys_flock(file, LOCK_UN) If Thread 2 removes the lock from inode->i_lock before Thread 1 tests for list_empty(&lock->fl_link) at the end of sys_flock, then both threads will end up calling locks_free_lock for the same lock. Fix is to make flock_lock_file() do the same as posix_lock_file(), namely to make a copy of the request, so that the caller can always free the lock. This also has the side-effect of fixing up a reference problem in the lockd handling of flock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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