Re: [PATCH] IPC: bugfix for msgrcv with msgtyp < 0

[Peter Hurley]

On 08/26/2013 04:42 PM, Andrew Morton wrote:
> On Sat, 24 Aug 2013 08:49:25 -0400 Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> 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.

Commit daaf74cf0867e3042090d56d10b194d6265b4684,
ipc: refactor msg list search into separate function
introduced this regression.

Regards,
Peter Hurley

> > Reviewed-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>

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