kcore: fix test for end of list

"m" is never NULL here.  We need a different test for the end of list
condition.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index a44a7897fd4d20988aa933a89fab2d9c1600d53a..b442dac8f5f99f5366c55eef420b6fb51120c5f0 100644 (file)
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -490,7 +490,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
                }
                read_unlock(&kclist_lock);
 
                }
                read_unlock(&kclist_lock);
 

-               if (m == NULL) {
+               if (&m->list == &kclist_head) {

                        if (clear_user(buffer, tsz))
                                return -EFAULT;
                } else if (is_vmalloc_or_module_addr((void *)start)) {
                        if (clear_user(buffer, tsz))
                                return -EFAULT;
                } else if (is_vmalloc_or_module_addr((void *)start)) {