From: Raghavan <raghav@in.ibm.com>,
      me

I am submitting a patch that fixes 2 race conditions in the 32 bit ioctl
emulation code.(fs/compat.c) Since the search is not locked; when a
ioctl_trans structure is deleted, corruption can occur.

The following scenarios discuss the race conditions:

1) When the search is hapenning, if any ioctl_trans structure gets
   deleted; then rather than searching the hash table, the code will start
   searching the free list.

while (t && t->cmd != cmd)
        -