linux-kernel - [ 043/171] RDMA/nes: Fix for crash when registering zero length MR for CQ

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Date:	Tue, 15 Jan 2013 14:43:28 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>,
	Roland Dreier <roland@...estorage.com>,
	CAI Qian <caiqian@...hat.com>
Subject: [ 043/171] RDMA/nes: Fix for crash when registering zero length MR for CQ

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>

commit 7d9c199a55200c9b9fcad08e150470d02fb385be upstream.

Signed-off-by: Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>
Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: CAI Qian <caiqian@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/hw/nes/nes_verbs.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/infiniband/hw/nes/nes_verbs.c
+++ b/drivers/infiniband/hw/nes/nes_verbs.c
@@ -2559,6 +2559,11 @@ static struct ib_mr *nes_reg_user_mr(str
 			return ibmr;
 		case IWNES_MEMREG_TYPE_QP:
 		case IWNES_MEMREG_TYPE_CQ:
+			if (!region->length) {
+				nes_debug(NES_DBG_MR, "Unable to register zero length region for CQ\n");
+				ib_umem_release(region);
+				return ERR_PTR(-EINVAL);
+			}
 			nespbl = kzalloc(sizeof(*nespbl), GFP_KERNEL);
 			if (!nespbl) {
 				nes_debug(NES_DBG_MR, "Unable to allocate PBL\n");


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