Be more robust about bad arguments in get_user_pages()

[safe/jmp/linux-2.6] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index e5628a5..717aa0e 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -989,6 +989,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
        int i;
        unsigned int vm_flags;
 
+       if (len <= 0)
+               return 0;
        /* 
         * Require read or write permissions.
         * If 'force' is set, we only require the "MAY" flags.