[Qemu-devel] [PATCH RFC 4/4] memory-backend-file: error out if failed to allocate memory

[Hu Tao]

If user adds a memory-backend-file object using object_add command,
specifying a non-existing directory for property mem-path, qemu
will core dump with message:

  /nonexistingdir: No such file or directory
  Bad ram offset fffffffffffff000
  Aborted (core dumped)

This patch fixes this problem.

Signed-off-by: Hu Tao <hu...@cn.fujitsu.com>
---
 backends/hostmem-file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index 5179994..70172d1 100644
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -55,6 +55,9 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error 
**errp)
                                  object_get_canonical_path(OBJECT(backend)),
                                  backend->size, fb->share,
                                  fb->mem_path, errp);
+        if (backend->mr.ram_addr == -1) {
+            error_setg(errp, "failed to allocate memory");
+        }
     }
 #endif
 }
-- 
1.9.3