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address_space_map: address_space_to_flatview needs RCU lock 

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 <aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-03-05 00:23:26 +01:00
parent 11e732a5ed
commit ad0c60fa57
1 changed files with 2 additions and 1 deletions
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3
exec.c
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@ -3468,7 +3468,7 @@ 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;
@ -3476,6 +3476,7 @@ 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)) {