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Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=9825
The inet_diag_lock_handler function uses ERR_PTR to encode errors but
its callers were testing against NULL.
This only happens when the only inet_diag modular user, DCCP, is not
built into the kernel or available as a module.
Also there was a problem with not dropping the mutex lock when a handler
was not found, also fixed in this patch.
This caused an OOPS and ss would then hang on subsequent calls, as
&inet_diag_table_mutex was being left locked.
Thanks to spike at ml.yaroslavl.ru for report it after trying 'ss -d'
on a kernel that doesn't have DCCP available.
This bug was introduced in cset
d523a328fb0271e1a763e985a21f2488fd816e7e ("Fix inet_diag dead-lock
regression"), after 2.6.24-rc3, so just 2.6.24 seems to be affected.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
8cf8e5a67f