fix devtmpfs race

After we's done complete(&req->done), there's nothing to prevent the
scope containing *req from being gone and *req overwritten by any
kind of junk.  So we must read req->next before that...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 6d678c99512e..b89fffc1d777 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -406,9 +406,10 @@ static int devtmpfsd(void *p)
                         requests = NULL;
                         spin_unlock(&req_lock);
                         while (req) {
+                                struct req *next = req->next;
                                 req->err = handle(req->name, req->mode, req->dev);
                                 complete(&req->done);
-                                req = req->next;
+                                req = next;
                         }
                         spin_lock(&req_lock);
                 }