[PATCH] migration: Fix parse_ramblock() on overwritten retvals

[Peter Xu]

It's possible that some errors can be overwritten with success retval later
on, and then ignored.  Always capture all errors and report.

Reported by Coverity 1522861, but actually I spot one more in the same
function.

Fixes: CID 1522861
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/ram.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index c844151ee9..d8bdb53a8f 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3888,6 +3888,8 @@ static int parse_ramblock(QEMUFile *f, RAMBlock *block, 
ram_addr_t length)
         ret = qemu_ram_resize(block, length, &local_err);
         if (local_err) {
             error_report_err(local_err);
+            assert(ret < 0);
+            return ret;
         }
     }
     /* For postcopy we need to check hugepage sizes match */
@@ -3898,7 +3900,7 @@ static int parse_ramblock(QEMUFile *f, RAMBlock *block, 
ram_addr_t length)
             error_report("Mismatched RAM page size %s "
                          "(local) %zd != %" PRId64, block->idstr,
                          block->page_size, remote_page_size);
-            ret = -EINVAL;
+            return -EINVAL;
         }
     }
     if (migrate_ignore_shared()) {
@@ -3908,7 +3910,7 @@ static int parse_ramblock(QEMUFile *f, RAMBlock *block, 
ram_addr_t length)
             error_report("Mismatched GPAs for block %s "
                          "%" PRId64 "!= %" PRId64, block->idstr,
                          (uint64_t)addr, (uint64_t)block->mr->addr);
-            ret = -EINVAL;
+            return -EINVAL;
         }
     }
     ret = rdma_block_notification_handle(f, block->idstr);
-- 
2.41.0