Index: qemu/linux-user/path.c
===================================================================
--- qemu.orig/linux-user/path.c	2007-11-28 23:13:12.000000000 -0700
+++ qemu/linux-user/path.c	2007-11-28 23:13:24.000000000 -0700
@@ -152,7 +152,7 @@
 {
     /* Only do absolute paths: quick and dirty, but should mostly be OK.
        Could do relative by tracking cwd. */
-    if (!base || name[0] != '/')
+    if (!base || !name || name[0] != '/')
 	return name;
 
     return follow_path(base, name) ?: name;
Index: qemu/linux-user/syscall.c
===================================================================
--- qemu.orig/linux-user/syscall.c	2007-11-28 23:01:10.000000000 -0700
+++ qemu/linux-user/syscall.c	2007-11-28 23:13:06.000000000 -0700
@@ -3864,8 +3864,12 @@
         goto unimplemented;
 #endif
     case TARGET_NR_acct:
-        if (!(p = lock_user_string(arg1)))
-            goto efault;
+        if (arg1) {
+            if (!(p = lock_user_string(arg1)))
+                goto efault;
+        } else {
+            p = NULL;
+        }
         ret = get_errno(acct(path(p)));
         unlock_user(p, arg1, 0);
         break;