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[032/113] address_space_map: address_space_to_flatview needs RCU lock

Message ID 20180619014319.28272-33-mdroth@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Michael Roth June 19, 2018, 1:41 a.m. UTC 
From: Paolo Bonzini <pbonzini@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 <aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit ad0c60fa572d4050255b698ecdb67294dd4c0125)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 exec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox

Patch

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)) {