commit 6157dbbfbf9d8e4a2b6d4e5ee35e864ab9ee8414
author Davidlohr Bueso <dave@stgolabs.net> Tue Jun 30 14:58:48 2015 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Tue Jun 30 19:44:59 2015 -0700
tree 261947d302e567e7657642c1b2a5d5ca25bedcab
parent f8b5918495be32807c4f878de959540eb63a9b9f

ipc,sysv: return -EINVAL upon incorrect id/seqnum

In ipc_obtain_object_check we return -EIDRM when a bogus sequence number
is detected via ipc_checkid, while the ipc manpages state the following
return codes for such errors:

   EIDRM  <ID> points to a removed identifier.
   EINVAL Invalid <ID> value, or unaligned, etc.

EIDRM should only be returned upon a RMID call (->deleted check), and thus
return EINVAL for wrong seq.  This difference in semantics has also caused
real bugs, ie: https://bugzilla.redhat.com/show_bug.cgi?id=246509

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>