From: Paolo Bonzini <pbonz...@redhat.com>
address_space_map is calling address_space_to_flatview but it can
be called outside the RCU lock. The function itself is calling
rcu_read_lock/rcu_read_unlock, just in the wrong place, so the
fix is easy.
Reviewed-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
(cherry picked from commit ad0c60fa572d4050255b698ecdb67294dd4c0125)
Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com>
---
exec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/exec.c b/exec.c
index 7c4fb68368..e30155c113 100644
--- a/exec.c
+++ b/exec.c
@@ -3395,7 +3395,7 @@ void *address_space_map(AddressSpace *as,
hwaddr l, xlat;
MemoryRegion *mr;
void *ptr;
- FlatView *fv = address_space_to_flatview(as);
+ FlatView *fv;
if (len == 0) {
return NULL;
@@ -3403,6 +3403,7 @@ void *address_space_map(AddressSpace *as,
l = len;
rcu_read_lock();
+ fv = address_space_to_flatview(as);
mr = flatview_translate(fv, addr, &xlat, &l, is_write);
if (!memory_access_is_direct(mr, is_write)) {
--
2.11.0
