linux-kernel - [PATCH 2/4] f2fs: return early when trying to read null nid

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Message-Id: <1450923320-41113-2-git-send-email-jaegeuk@kernel.org>
Date:	Wed, 23 Dec 2015 18:15:18 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 2/4] f2fs: return early when trying to read null nid

If get_node_page() gets zero nid, we can return early without getting a wrong
page. For example, get_dnode_of_data() can try to do that.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/node.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 341de5d..e17128d 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1059,6 +1059,9 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
 {
 	struct page *page;
 	int err;
+
+	if (!nid)
+		return ERR_PTR(-ENOENT);
 repeat:
 	page = grab_cache_page(NODE_MAPPING(sbi), nid);
 	if (!page)
-- 
2.5.4 (Apple Git-61)

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