util: Don't overflow on errno in virFileAccessibleAs

If we need to virFork() to check assess() under different
UID+GID we need to translate returned status via WEXITSTATUS().
Otherwise, we may return values greater than 255 which is
obviously wrong.

diff --git a/src/util/util.c b/src/util/util.c
index 548ed1cbea9bc3a9a222cf89a50fdc09850150d8..15e6cfa1717333cdc3f652a3a72b39eddf72df1a 100644 (file)
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -724,8 +724,13 @@ virFileAccessibleAs(const char *path, int mode,
                 return -1;
         }
 
+        if (!WIFEXITED(status)) {
+            errno = EINTR;
+            return -1;
+        }
+
         if (status) {
-            errno = status;
+            errno = WEXITSTATUS(status);
             return -1;
         }