diff options
| author | Colin Ian King <[email protected]> | 2022-12-02 13:51:49 +0000 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2022-12-27 12:44:00 +0100 |
| commit | 08245672cdc6505550d1a5020603b0a8d4a6dcc7 (patch) | |
| tree | 98a01f344a7b4888c3247ae02b5329a486883a5b | |
| parent | f841b682baef90ee144df8b12e2c76aa460717c1 (diff) | |
perf/x86/amd: fix potential integer overflow on shift of a int
The left shift of int 32 bit integer constant 1 is evaluated using 32 bit
arithmetic and then passed as a 64 bit function argument. In the case where
i is 32 or more this can lead to an overflow. Avoid this by shifting
using the BIT_ULL macro instead.
Fixes: 471af006a747 ("perf/x86/amd: Constrain Large Increment per Cycle events")
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Acked-by: Kim Phillips <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
| -rw-r--r-- | arch/x86/events/amd/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c index d6f3703e4119..4386b10682ce 100644 --- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -1387,7 +1387,7 @@ static int __init amd_core_pmu_init(void) * numbered counter following it. */ for (i = 0; i < x86_pmu.num_counters - 1; i += 2) - even_ctr_mask |= 1 << i; + even_ctr_mask |= BIT_ULL(i); pair_constraint = (struct event_constraint) __EVENT_CONSTRAINT(0, even_ctr_mask, 0, |