tree e7007ac80fc9dd6101db5c9ca07cbc0246b597e4
parent 482db6df1746c4fa7d64a2441d4cb2610249c679
author Robin Holt <holt@sgi.com> 1288128075 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1288137123 -0700

sgi-xp: incoming XPC channel messages can come in after the channel's partition structures have been torn down

Under some workloads, some channel messages have been observed being
delayed on the sending side past the point where the receiving side has
been able to tear down its partition structures.

This condition is already detected in xpc_handle_activate_IRQ_uv(), but
that information is not given to xpc_handle_activate_mq_msg_uv().  As a
result, xpc_handle_activate_mq_msg_uv() assumes the structures still exist
and references them, causing a NULL-pointer deref.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>