linux-kernel - [PATCH v1] fs: proc: Add error checking for d_hash_and

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Date:   Thu, 13 Jul 2023 19:32:48 +0800
From:   Wang Ming <machel@...o.com>
To:     Christian Brauner <brauner@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Chinner <dchinner@...hat.com>,
        Xiaokai Ran <ran.xiaokai@....com.cn>,
        Al Viro <viro@...iv.linux.org.uk>,
        xu xin <xu.xin16@....com.cn>,
        Zhihao Cheng <chengzhihao1@...wei.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Wang Ming <machel@...o.com>
Subject: [PATCH v1] fs: proc: Add error checking for d_hash_and_lookup()

In case of failure, d_hash_and_lookup() returns NULL or an error
pointer. The proc_fill_cache() needs to add the handling of the
error pointer returned by d_hash_and_lookup().

Signed-off-by: Wang Ming <machel@...o.com>
---
 fs/proc/base.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index bbc998fd2a2f..4c0e8329b318 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2071,6 +2071,8 @@ bool proc_fill_cache(struct file *file, struct dir_context *ctx,
 	ino_t ino = 1;
 
 	child = d_hash_and_lookup(dir, &qname);
+	if (IS_ERR(child))
+		goto end_instantiate;
 	if (!child) {
 		DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
 		child = d_alloc_parallel(dir, &qname, &wq);
-- 
2.25.1