[Xen-devel] [PATCH 1/2] xen/events: prevent calling evtchn_get on invlaid channels

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

The event channel number provided to evtchn_get can be provided by
userspace, so needs to be checked against the maximum number of event
channels prior to using it to index into evtchn_to_irq.

Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
 drivers/xen/events.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index a3bcd61..e5e5812 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1104,6 +1104,9 @@ int evtchn_get(unsigned int evtchn)
        struct irq_info *info;
        int err = -ENOENT;
 
+       if (evtchn >= NR_EVENT_CHANNELS)
+               return -EINVAL;
+
        mutex_lock(&irq_mapping_update_lock);
 
        irq = evtchn_to_irq[evtchn];
-- 
1.7.7.3


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