linux-kernel - [PATCH] perf/x86: fix undefined shift on 32-bit kernels

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Date:	Wed, 11 May 2016 16:51:51 +0300
From:	Andrey Ryabinin <aryabinin@...tuozzo.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Jim Cromie <jim.cromie@...il.com>, Imre Palik <imrep@...zon.de>,
	<linux-kernel@...r.kernel.org>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: [PATCH] perf/x86: fix undefined shift on 32-bit kernels

Jim reported:
	UBSAN: Undefined behaviour in arch/x86/events/intel/core.c:3708:12
	shift exponent 35 is too large for 32-bit type 'long unsigned int'

The use of 'unsigned long' type obviously is not correct here, make it
'unsigned long long' instead.

Fixes: 2c33645d366d ("perf/x86: Honor the architectural performance monitoring version")
Reported-by: Jim Cromie <jim.cromie@...il.com>
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
---
 arch/x86/events/intel/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index a6fd4db..5210eaa 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3708,7 +3708,7 @@ __init int intel_pmu_init(void)
 				c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
 			}
 			c->idxmsk64 &=
-				~(~0UL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed));
+				~(~0ULL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed));
 			c->weight = hweight64(c->idxmsk64);
 		}
 	}
-- 
2.7.3