From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
The 64 bit value read from MSR_ARCH_PERFMON_FIXED_CTR_CTRL is being
bit-wise masked with the value (0x03 << i*4). However, the shifted value
is evaluated using 32 bit arithmetic, so will overflow when i > 8.
Fix this by making 0x03 a ULL so that the shift is performed using
64 bit arithmetic.
Addresses-Coverity: ("Unintentional integer overflow")
Fixes: a5ebe0ba3dff ("perf/x86: Check all MSRs before passing hw check")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
arch/x86/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index bafd93c54ffa..59c665c8c2e9 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -261,7 +261,7 @@ static bool check_hw_exists(void)
for (i = 0; i < x86_pmu.num_counters_fixed; i++) {
if (fixed_counter_disabled(i))
continue;
- if (val & (0x03 << i*4)) {
+ if (val & (0x03ULL << i*4)) {
bios_fail = 1;
val_fail = val;
reg_fail = reg;
--
2.30.2
