linux-kernel - [PATCH] watch_queue: Fix wrong return value of watch_queue_set

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Message-ID: <20201112140354.2260499-1-zhangxiaoxu5@huawei.com>
Date:   Thu, 12 Nov 2020 09:03:54 -0500
From:   Zhang Xiaoxu <zhangxiaoxu5@...wei.com>
To:     <zhangxiaoxu5@...wei.com>, <dhowells@...hat.com>,
        <jarkko@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] watch_queue: Fix wrong return value of watch_queue_set_size()

If memory allocate failed, we should return -ENOMEM rather than 0.

Fixes: c73be61cede5 ("pipe: Add general notification queue support")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>
---
 kernel/watch_queue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c
index 0ef8f65bd2d7..3084060a52d2 100644
--- a/kernel/watch_queue.c
+++ b/kernel/watch_queue.c
@@ -247,6 +247,7 @@ long watch_queue_set_size(struct pipe_inode_info *pipe, unsigned int nr_notes)
 	if (ret < 0)
 		goto error;
 
+	ret = -ENOMEM;
 	pages = kcalloc(sizeof(struct page *), nr_pages, GFP_KERNEL);
 	if (!pages)
 		goto error;
-- 
2.25.4