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authorPaolo Bonzini <pbonzini@redhat.com>2018-03-05 00:23:26 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2018-03-06 14:01:28 +0100
commit11e732a5ed46903f997985bed4c3767ca28a7eb6 (patch)
treeb2169eca05c7c611f7544c1d5008dcb8fa81609c /exec.c
parentb2a44fcad74f1cc7a6786d38eba7db12ab2352ba (diff)
address_space_access_valid: address_space_to_flatview needs RCU lock
address_space_access_valid is calling address_space_to_flatview but it can be called outside the RCU lock. To fix it, push the rcu_read_lock/unlock pair up from flatview_access_valid to address_space_access_valid. Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'exec.c')
-rw-r--r--exec.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/exec.c b/exec.c
index e4552ee228..62ed49ddd5 100644
--- a/exec.c
+++ b/exec.c
@@ -3395,7 +3395,6 @@ static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
MemoryRegion *mr;
hwaddr l, xlat;
- rcu_read_lock();
while (len > 0) {
l = len;
mr = flatview_translate(fv, addr, &xlat, &l, is_write);
@@ -3410,15 +3409,20 @@ static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
len -= l;
addr += l;
}
- rcu_read_unlock();
return true;
}
bool address_space_access_valid(AddressSpace *as, hwaddr addr,
int len, bool is_write)
{
- return flatview_access_valid(address_space_to_flatview(as),
- addr, len, is_write);
+ FlatView *fv;
+ bool result;
+
+ rcu_read_lock();
+ fv = address_space_to_flatview(as);
+ result = flatview_access_valid(fv, addr, len, is_write);
+ rcu_read_unlock();
+ return result;
}
static hwaddr