The copy macro returns false when the copy fails.
Signed-off-by: Wei Liu <wei.l...@citrix.com>
---
Cc: Jan Beulich <jbeul...@suse.com>
Cc: Andrew Cooper <andrew.coop...@citrix.com>
Cc: Paul Durrant <paul.durr...@citrix.com>
Backport to 4.9
---
xen/arch/x86/hvm/dm.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index 87ef4b6ca9..9cf53b551c 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -178,11 +178,9 @@ static int modified_memory(struct domain *d,
struct xen_dm_op_modified_memory_extent extent;
unsigned int batch_nr;
xen_pfn_t pfn, end_pfn;
- int rc;
- rc = COPY_FROM_GUEST_BUF_OFFSET(extent,
- bufs, EXTENTS_BUFFER, (*rem_extents - 1) * sizeof(extent));
- if ( rc )
+ if ( !COPY_FROM_GUEST_BUF_OFFSET(extent, bufs, EXTENTS_BUFFER,
+ (*rem_extents - 1) * sizeof(extent)) )
return -EFAULT;
if ( extent.pad )
--
2.11.0
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