[PATCH] fuse: fix request_end()

This function used the request object after decrementing its reference count
and releasing the lock.  This could in theory lead to all sorts of problems.

Fix and simplify at the same time.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 11 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 9af88953db69..de402e4d8bce 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -171,19 +171,17 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
 /*
  * This function is called when a request is finished.  Either a reply
  * has arrived or it was interrupted (and not yet sent) or some error
- * occurred during communication with userspace, or the device file was
- * closed.  It decreases the reference count for the request.  In case
- * of a background request the reference to the stored objects are
- * released.  The requester thread is woken up (if still waiting), and
- * finally the request is either freed or put on the unused_list
+ * occurred during communication with userspace, or the device file
+ * was closed.  In case of a background request the reference to the
+ * stored objects are released.  The requester thread is woken up (if
+ * still waiting), and finally the reference to the request is
+ * released
  *
  * Called with fuse_lock, unlocks it
  */
 static void request_end(struct fuse_conn *fc, struct fuse_req *req)
 {
-	int putback;
 	req->finished = 1;
-	putback = atomic_dec_and_test(&req->count);
 	spin_unlock(&fuse_lock);
 	if (req->background) {
 		down_read(&fc->sbput_sem);
@@ -197,13 +195,11 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
 	else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {
 		/* Special case for failed iget in CREATE */
 		u64 nodeid = req->in.h.nodeid;
-		__fuse_get_request(req);
 		fuse_reset_request(req);
 		fuse_send_forget(fc, req, nodeid, 1);
-		putback = 0;
+		return;
 	}
-	if (putback)
-		fuse_putback_request(fc, req);
+	fuse_put_request(fc, req);
 }
 
 /*