linux-kernel - [PATCH 5.19 133/192] erofs: fix error return code in erofs_fscache_{meta_,}read

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Message-Id: <20220913140416.637808524@linuxfoundation.org>
Date:   Tue, 13 Sep 2022 16:03:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sun Ke <sunke32@...wei.com>,
        Jingbo Xu <jefflexu@...ux.alibaba.com>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>,
        Chao Yu <chao@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 133/192] erofs: fix error return code in erofs_fscache_{meta_,}read_folio

From: Sun Ke <sunke32@...wei.com>

[ Upstream commit 5bd9628b784cc5e38e1c7ebb680bbd6ee741230e ]

If erofs_fscache_alloc_request fail and then goto out, it will return 0.
it should return a negative error code instead of 0.

Fixes: d435d53228dd ("erofs: change to use asynchronous io for fscache readpage/readahead")
Signed-off-by: Sun Ke <sunke32@...wei.com>
Reviewed-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Reviewed-by: Chao Yu <chao@...nel.org>
Link: https://lore.kernel.org/r/20220815034829.3940803-1-sunke32@huawei.com
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/erofs/fscache.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 8e01d89c3319e..b5fd9d71e67f1 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -222,8 +222,10 @@ static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
 
 	rreq = erofs_fscache_alloc_request(folio_mapping(folio),
 				folio_pos(folio), folio_size(folio));
-	if (IS_ERR(rreq))
+	if (IS_ERR(rreq)) {
+		ret = PTR_ERR(rreq);
 		goto out;
+	}
 
 	return erofs_fscache_read_folios_async(mdev.m_fscache->cookie,
 				rreq, mdev.m_pa);
@@ -301,8 +303,10 @@ static int erofs_fscache_read_folio(struct file *file, struct folio *folio)
 
 	rreq = erofs_fscache_alloc_request(folio_mapping(folio),
 				folio_pos(folio), folio_size(folio));
-	if (IS_ERR(rreq))
+	if (IS_ERR(rreq)) {
+		ret = PTR_ERR(rreq);
 		goto out_unlock;
+	}
 
 	pstart = mdev.m_pa + (pos - map.m_la);
 	return erofs_fscache_read_folios_async(mdev.m_fscache->cookie,
-- 
2.35.1