linux-kernel - [PATCH] block: return specific error when pointer is NULL

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Date:   Wed, 22 Dec 2021 18:24:03 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] block: return specific error when pointer is NULL

From: Wang Qing <wangqing@...o.com>

loop_attr_backing_file_show() better return specific error than 0 
when pointer is NULL

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/block/loop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e52a8a5..860a5b6
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -667,7 +667,7 @@ static ssize_t loop_attr_backing_file_show(struct loop_device *lo, char *buf)
 	spin_unlock_irq(&lo->lo_lock);
 
 	if (IS_ERR_OR_NULL(p))
-		ret = PTR_ERR(p);
+		ret = p ? PTR_ERR(p) : -ENOENT;
 	else {
 		ret = strlen(p);
 		memmove(buf, p, ret);
-- 
2.7.4