[Xen-devel] [PATCH] x86/irq: Fix undefined behaviour in irq_move_cleanup_interrupt()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

UBSAN reports:

  (XEN) 
================================================================================
  (XEN) UBSAN: Undefined behaviour in irq.c:682:22
  (XEN) left shift of 1 by 31 places cannot be represented in type 'int'
  (XEN) ----[ Xen-4.13-unstable  x86_64  debug=y   Not tainted ]----
  (XEN) CPU:    16
  (XEN) RIP:    e008:[<ffff82d0802a54ce>] ubsan.c#ubsan_epilogue+0xa/0xc2
  <snip>
  (XEN) Xen call trace:
  (XEN)    [<ffff82d0802a54ce>] ubsan.c#ubsan_epilogue+0xa/0xc2
  (XEN)    [<ffff82d0802a6009>] __ubsan_handle_shift_out_of_bounds+0x15d/0x16c
  (XEN)    [<ffff82d08031ae77>] irq_move_cleanup_interrupt+0x25c/0x4a0
  (XEN)    [<ffff82d08031b585>] do_IRQ+0x19d/0x104c
  (XEN)    [<ffff82d08050c8ba>] common_interrupt+0x10a/0x120
  (XEN)    [<ffff82d0803b13a6>] cpu_idle.c#acpi_idle_do_entry+0x1de/0x24b
  (XEN)    [<ffff82d0803b1d83>] cpu_idle.c#acpi_processor_idle+0x5c8/0x94e
  (XEN)    [<ffff82d0802fa8d6>] domain.c#idle_loop+0xee/0x101
  (XEN)
  (XEN) 
================================================================================

Switch to an unsigned shift, and correct the surrounding style.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/irq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index d6451a9..6847fb4 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -679,7 +679,8 @@ void irq_move_cleanup_interrupt(struct cpu_user_regs *regs)
          * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
          * to myself.
          */
-        if (irr  & (1 << (vector % 32))) {
+        if ( irr & (1u << (vector % 32)) )
+        {
             send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
             TRACE_3D(TRC_HW_IRQ_MOVE_CLEANUP_DELAY,
                      irq, vector, smp_processor_id());
-- 
2.1.4


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