[Xen-changelog] [xen master] libxc: don't pass uninitialized data to do_dm_op()

[patchbot@xxxxxxx]

commit 78da0c2a7a9c621ba64e515528e11e5f28f15050
Author:     Jan Beulich <JBeulich@xxxxxxxx>
AuthorDate: Mon Feb 20 16:53:27 2017 +0000
Commit:     Wei Liu <wei.liu2@xxxxxxxxxx>
CommitDate: Mon Feb 20 16:53:27 2017 +0000

    libxc: don't pass uninitialized data to do_dm_op()
    
    do_dm_op() expects (void *, size_t) pairs, but with nr being uint32_t
    the type of the expression of xc_hvm_track_dirty_vram()'s last argument
    to the function is only a 32 bits one. Neither C nor the ABI require
    the compiler to promote the type beyond int.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxc/xc_misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 0fc6c22..5159475 100644
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -560,7 +560,7 @@ int xc_hvm_track_dirty_vram(
     data->nr = nr;
 
     return do_dm_op(xch, dom, 2, &op, sizeof(op),
-                    dirty_bitmap, (nr + 7) / 8);
+                    dirty_bitmap, (size_t)((nr + 7) / 8));
 }
 
 int xc_hvm_modified_memory(
--
generated by git-patchbot for /home/xen/git/xen.git#master

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