[PATCH 5.15 559/667] s390/perf: obtain sie_block from the right address

[Greg Kroah-Hartman]

From: Nico Boehr <nrb@xxxxxxxxxxxxx>

commit c9bfb460c3e4da2462e16b0f0b200990b36b1dd2 upstream.

Since commit 1179f170b6f0 ("s390: fix fpu restore in entry.S"), the
sie_block pointer is located at empty1[1], but in sie_block() it was
taken from empty1[0].

This leads to a random pointer being dereferenced, possibly causing
system crash.

This problem can be observed when running a simple guest with an endless
loop and recording the cpu-clock event:

  sudo perf kvm --guestvmlinux=<guestkernel> --guest top -e cpu-clock

With this fix, the correct guest address is shown.

Fixes: 1179f170b6f0 ("s390: fix fpu restore in entry.S")
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Acked-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Reviewed-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/s390/kernel/perf_event.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/s390/kernel/perf_event.c
+++ b/arch/s390/kernel/perf_event.c
@@ -30,7 +30,7 @@ static struct kvm_s390_sie_block *sie_bl
 	if (!stack)
 		return NULL;
 
-	return (struct kvm_s390_sie_block *) stack->empty1[0];
+	return (struct kvm_s390_sie_block *)stack->empty1[1];
 }
 
 static bool is_in_guest(struct pt_regs *regs)