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From:   Roger Pau Monne <roger.pau@citrix.com>
To:     <linux-kernel@vger.kernel.org>
CC:     Roger Pau Monne <roger.pau@citrix.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>, Amit Shah <aams@amazon.com>,
        <stable@vger.kernel.org>, <xen-devel@lists.xenproject.org>
Subject: [PATCH] xen/pirq: fix error path cleanup when binding MSIs
Date:   Wed, 28 Feb 2018 09:19:03 +0000
Message-ID: <20180228091903.99889-1-roger.pau@citrix.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Current cleanup in the error path of xen_bind_pirq_msi_to_irq is
wrong. First of all there's an off-by-one in the cleanup loop, which
can lead to unbinding wrong IRQs.

Secondly IRQs not bound won't be freed, thus leaking IRQ numbers.

Note that there's no need to differentiate between bound and unbound
IRQs when freeing them, __unbind_from_irq will deal with both of them
correctly.

Fixes: 4892c9b4ada9f9 ("xen: add support for MSI message groups")
Reported-by: Hooman Mirhadi <mirhadih@amazon.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Amit Shah <aams@amazon.com>
CC: stable@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
---
 drivers/xen/events/events_base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index b241bfa529ce..159faf1269fb 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -763,8 +763,8 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 	mutex_unlock(&irq_mapping_update_lock);
 	return irq;
 error_irq:
-	for (; i >= 0; i--)
-		__unbind_from_irq(irq + i);
+	while (nvec--)
+		__unbind_from_irq(irq + nvec);
 	mutex_unlock(&irq_mapping_update_lock);
 	return ret;
 }
-- 
2.16.1