linux-kernel - [f2fs-dev] [PATCH 2/2] f2fs: fix infinite loop in __insert_extent

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Message-ID: <20250910135835.2751574-2-wangzijie1@honor.com>
Date: Wed, 10 Sep 2025 21:58:35 +0800
From: wangzijie <wangzijie1@...or.com>
To: <jaegeuk@...nel.org>, <chao@...nel.org>
CC: <bintian.wang@...or.com>, <feng.han@...or.com>,
	<linux-kernel@...r.kernel.org>, <linux-f2fs-devel@...ts.sourceforge.net>,
	wangzijie <wangzijie1@...or.com>
Subject: [f2fs-dev] [PATCH 2/2] f2fs: fix infinite loop in __insert_extent_tree()

When we get wrong extent info data, and look up extent_node in rb tree,
it will cause infinite loop (CONFIG_F2FS_CHECK_FS=n). Avoiding this by
return NULL.

Signed-off-by: wangzijie <wangzijie1@...or.com>
---
 fs/f2fs/extent_cache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 199c1e7a8..6ed6f3d1d 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -605,6 +605,7 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
 			leftmost = false;
 		} else {
 			f2fs_bug_on(sbi, 1);
+			return NULL;
 		}
 	}
 
-- 
2.25.1