[xfs-masters] [Bug 7632] New: Race: a lock should be acquired before calling bhv_base_unlocked

[bugme-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.kernel.org/show_bug.cgi?id=7632

           Summary: Race: a lock should be acquired before calling
                    bhv_base_unlocked
    Kernel Version: 2.6.18
            Status: NEW
          Severity: normal
             Owner: xfs-masters@xxxxxxxxxxx
         Submitter: tammy000@xxxxxxxxx


Potential Data Race: a lock should be acquired before calling bhv_base_unlocked
according to comments before bhv_base. However, in the following 
call chain, no lock is acquired before calling 
435         bdp = bhv_base_unlocked(VN_BHV_HEAD(vp));
(This code is in file fs/xfs/linux-2.6/xfs_ioctl.c)

The call chain is:
xfs_ioctl  calls
xfs_fssetdm_by_handle calls
bhv_base_unlocked

In the entire call chain, no lock is acquired for calling bhv_base_unlocked, and
xfs_ioctl can be exposed functions outside the module, which can be very 
dangerous.

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