linux-kernel - Re: [PATCH] IPC: bugfix for msgrcv with msgtyp

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Message-Id: <20130826134250.66830c1a551f6619544bd6a8@linux-foundation.org>
Date:	Mon, 26 Aug 2013 13:42:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Svenning Sørensen <sss@...omea.dk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IPC: bugfix for msgrcv with msgtyp < 0

On Sat, 24 Aug 2013 08:49:25 -0400 Peter Hurley <peter@...leysoftware.com> wrote:

> On 08/24/2013 07:44 AM, Svenning S__rensen wrote:
> > According to 'man msgrcv':
> > "If msgtyp is less than 0, the first message of the lowest type that is less
> > than or equal to the absolute value of msgtyp shall be received."
> >
> > Bug: The kernel only returns a message if its type is 1; other messages with
> > type < abs(msgtype) will never get returned.
> >
> > Fix: After having traversed the list to find the first message with the
> > lowest type, we need to actually return that message.
> 
> Sorry for the breakage. Needs to go to -stable as well.

Do you know which commit caused the regression?  That would help those
who wish to fix up their kernels.

> Reviewed-by: Peter Hurley <peter@...leysoftware.com>
> 
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