[Patch v10 4/6] core/loader: add check for zero size in load_image_targphys_as

[Vishal Chourasia <vishalc@linux.ibm.com>]

Currently load_image_targphys_as() returns -1 on file open failure or
when max size is exceeded. Add an explicit check for zero-sized files
to catch this error early, since some callers check for size <= 0.

Also, remove the redundant size > 0 check later in the function.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Vishal Chourasia <vishalc@linux.ibm.com>
---
 hw/core/loader.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/hw/core/loader.c b/hw/core/loader.c
index d7c11c18f1..590c5b02aa 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -140,18 +140,21 @@ ssize_t load_image_targphys_as(const char *filename,
         return -1;
     }
 
+    if (size == 0) {
+        error_setg(errp, "empty file: %s", filename);
+        return -1;
+    }
+
     if (size > max_sz) {
         error_setg(errp, "%s exceeds maximum image size (%s)",
                    filename, size_to_str(max_sz));
         return -1;
     }
 
-    if (size > 0) {
-        if (rom_add_file_fixed_as(filename, addr, -1, as) < 0) {
-            error_setg(errp, "could not load '%s' at %" HWADDR_PRIx,
-                       filename, addr);
-            return -1;
-        }
+    if (rom_add_file_fixed_as(filename, addr, -1, as) < 0) {
+        error_setg(errp, "could not load '%s' at %" HWADDR_PRIx,
+                   filename, addr);
+        return -1;
     }
     return size;
 }
-- 
2.51.0