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| author |   Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2011-11-28 11:49:09 -0500 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-12-16 11:25:54 -0500 |
| commit | c3b3f16d1bceb5ac5f21528f889810b4ac5a3596 (patch) | |
| tree | 1447aa5bd9e3ff8e682dde597485cbfc857e054f /drivers/xen/events.c | |
| parent | xen/granttable: Support transitive grants (diff) | |
| download | linux-dev-c3b3f16d1bceb5ac5f21528f889810b4ac5a3596.tar.xz linux-dev-c3b3f16d1bceb5ac5f21528f889810b4ac5a3596.zip | |
xen/events: prevent calling evtchn_get on invalid channels
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@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/events.c')
| -rw-r--r-- | 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 a3bcd6175f4a..e5e5812a1014 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]; |