Patch "cachefiles: remove err_put_fd label in cachefiles_ondemand_daemon_read()" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    cachefiles: remove err_put_fd label in cachefiles_ondemand_daemon_read()

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cachefiles-remove-err_put_fd-label-in-cachefiles_ond.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit cad9ddac3303dd901631002ce72419969319f074
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date:   Wed May 22 19:43:01 2024 +0800

    cachefiles: remove err_put_fd label in cachefiles_ondemand_daemon_read()
    
    [ Upstream commit 3e6d704f02aa4c50c7bc5fe91a4401df249a137b ]
    
    The err_put_fd label is only used once, so remove it to make the code
    more readable. In addition, the logic for deleting error request and
    CLOSE request is merged to simplify the code.
    
    Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240522114308.2402121-6-libaokun@xxxxxxxxxxxxxxx
    Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
    Reviewed-by: Jia Zhu <zhujia.zj@xxxxxxxxxxxxx>
    Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
    Reviewed-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
    Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
    Stable-dep-of: 4988e35e95fc ("cachefiles: never get a new anonymous fd if ondemand_id is valid")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index 7b667ddc84ca5..c8389bb118f5b 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -337,7 +337,6 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
 {
 	struct cachefiles_req *req;
 	struct cachefiles_msg *msg;
-	unsigned long id = 0;
 	size_t n;
 	int ret = 0;
 	XA_STATE(xas, &cache->reqs, cache->req_id_next);
@@ -372,49 +371,37 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
 	cachefiles_grab_object(req->object, cachefiles_obj_get_read_req);
 	xa_unlock(&cache->reqs);
 
-	id = xas.xa_index;
-
 	if (msg->opcode == CACHEFILES_OP_OPEN) {
 		ret = cachefiles_ondemand_get_fd(req);
 		if (ret) {
 			cachefiles_ondemand_set_object_close(req->object);
-			goto error;
+			goto out;
 		}
 	}
 
-	msg->msg_id = id;
+	msg->msg_id = xas.xa_index;
 	msg->object_id = req->object->ondemand->ondemand_id;
 
 	if (copy_to_user(_buffer, msg, n) != 0) {
 		ret = -EFAULT;
-		goto err_put_fd;
-	}
-
-	cachefiles_put_object(req->object, cachefiles_obj_put_read_req);
-	/* CLOSE request has no reply */
-	if (msg->opcode == CACHEFILES_OP_CLOSE) {
-		xa_erase(&cache->reqs, id);
-		complete(&req->done);
+		if (msg->opcode == CACHEFILES_OP_OPEN)
+			close_fd(((struct cachefiles_open *)msg->data)->fd);
 	}
-
-	cachefiles_req_put(req);
-	return n;
-
-err_put_fd:
-	if (msg->opcode == CACHEFILES_OP_OPEN)
-		close_fd(((struct cachefiles_open *)msg->data)->fd);
-error:
+out:
 	cachefiles_put_object(req->object, cachefiles_obj_put_read_req);
-	xas_reset(&xas);
-	xas_lock(&xas);
-	if (xas_load(&xas) == req) {
-		req->error = ret;
-		complete(&req->done);
-		xas_store(&xas, NULL);
+	/* Remove error request and CLOSE request has no reply */
+	if (ret || msg->opcode == CACHEFILES_OP_CLOSE) {
+		xas_reset(&xas);
+		xas_lock(&xas);
+		if (xas_load(&xas) == req) {
+			req->error = ret;
+			complete(&req->done);
+			xas_store(&xas, NULL);
+		}
+		xas_unlock(&xas);
 	}
-	xas_unlock(&xas);
 	cachefiles_req_put(req);
-	return ret;
+	return ret ? ret : n;
 }
 
 typedef int (*init_req_fn)(struct cachefiles_req *req, void *private);