linux-kernel - [PATCH 08/14] aoe: disallow unsupported AoE minor addresses

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Message-Id: <c1f14dc6b8097c6d0b3780d422c13ffc0ee2b259.1346158422.git.ecashin@coraid.com>
Date:	Sat, 25 Aug 2012 10:39:51 -0400
From:	Ed Cashin <ecashin@...aid.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, ecashin@...aid.com
Subject: [PATCH 08/14] aoe: disallow unsupported AoE minor addresses

A guard is inserted to prevent AoE minor addresses (slot addresses)
higher than 15 to be used, as they are not yet supported by the
driver.

There is a change coming that will allow the aoe driver to overcome
this limit by using system device minor numbers dynamically, but until
then, this guard prevents unexpected targets from being used by the
driver when AoE targets with high minor numbers are on the AoE
network.

Signed-off-by: Ed Cashin <ecashin@...aid.com>
---
 drivers/block/aoe/aoecmd.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 7f9cc44..61cc1cf 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -1359,6 +1359,13 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
 			"Check shelf dip switches.\n");
 		return;
 	}
+	if (h->minor >= NPERSHELF) {
+		pr_err("aoe: e%ld.%d %s, %d\n",
+			aoemajor, h->minor,
+			"slot number larger than the maximum",
+			NPERSHELF-1);
+		return;
+	}
 
 	sysminor = SYSMINOR(aoemajor, h->minor);
 	if (sysminor * AOE_PARTITIONS + AOE_PARTITIONS > MINORMASK) {
-- 
1.7.2.5

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