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xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code

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commit 70513d5875 upstream.

Otherwise we may leak kernel stack for events that sample user
registers.

Reported-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Boris Ostrovsky 2018-07-12 13:27:00 -04:00 committed by Greg Kroah-Hartman
parent 29a6193c0d
commit ecde7ed3e8
1 changed files with 1 additions and 1 deletions
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arch/x86/xen/pmu.c
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@ -477,7 +477,7 @@ static void xen_convert_regs(const struct xen_pmu_regs *xen_regs,
irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id)
{
int err, ret = IRQ_NONE;
struct pt_regs regs;
struct pt_regs regs = {0};
const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
uint8_t xenpmu_flags = get_xenpmu_flags();