linux-kernel - Re: [Patch 3/4] ipc/mqueue: strengthen checks on mqueue creation

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Date:	Tue, 1 May 2012 16:11:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	Doug Ledford <dledford@...hat.com>, linux-kernel@...r.kernel.org,
	sfr@...b.auug.org.au
Subject: Re: [Patch 3/4] ipc/mqueue: strengthen checks on mqueue creation

On Tue, 01 May 2012 19:04:53 -0400
KOSAKI Motohiro <kosaki.motohiro@...il.com> wrote:

> > OK, then would EOVERFLOW suit things better?
> 
> I have no seen to any confusion source this. thank you.

--- a/ipc/mqueue.c~ipc-mqueue-strengthen-checks-on-mqueue-creation-fix
+++ a/ipc/mqueue.c
@@ -687,13 +687,13 @@ static int mq_attr_ok(struct ipc_namespa
 	}
 	/* check for overflow */
 	if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg)
-		return -ENOMEM;
+		return -EOVERFLOW;
 	mq_treesize = attr->mq_maxmsg * sizeof(struct msg_msg) +
 		min_t(unsigned int, attr->mq_maxmsg, MQ_PRIO_MAX) *
 		sizeof(struct posix_msg_tree_node);
 	total_size = attr->mq_maxmsg * attr->mq_msgsize;
 	if (total_size + mq_treesize < total_size)
-		return -ENOMEM;
+		return -EOVERFLOW;
 	return 0;
 }
 
_

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