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| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2024-09-04 11:13:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-17 16:21:00 +0300 |
| commit | f0572b8467d33d9d408bd0bc769bb173006399de (patch) | |
| tree | 851582eba51ad4dc927d12dab775d3df71abbefc /fs/nilfs2 | |
| parent | f68523e0f26faade18833fbef577a4295d8e2c94 (diff) | |
| download | linux-f0572b8467d33d9d408bd0bc769bb173006399de.tar.xz | |
nilfs2: determine empty node blocks as corrupted
[ Upstream commit 111b812d3662f3a1b831d19208f83aa711583fe6 ]
Due to the nature of b-trees, nilfs2 itself and admin tools such as
mkfs.nilfs2 will never create an intermediate b-tree node block with 0
child nodes, nor will they delete (key, pointer)-entries that would result
in such a state. However, it is possible that a b-tree node block is
corrupted on the backing device and is read with 0 child nodes.
Because operation is not guaranteed if the number of child nodes is 0 for
intermediate node blocks other than the root node, modify
nilfs_btree_node_broken(), which performs sanity checks when reading a
b-tree node block, so that such cases will be judged as metadata
corruption.
Link: https://lkml.kernel.org/r/20240904081401.16682-3-konishi.ryusuke@gmail.com
Fixes: 17c76b0104e4 ("nilfs2: B-tree based block mapping")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Lizhi Xu <lizhi.xu@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/nilfs2')
| -rw-r--r-- | fs/nilfs2/btree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c index 56f7752ec19a..4c81bc9f48ad 100644 --- a/fs/nilfs2/btree.c +++ b/fs/nilfs2/btree.c @@ -350,7 +350,7 @@ static int nilfs_btree_node_broken(const struct nilfs_btree_node *node, if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN || level >= NILFS_BTREE_LEVEL_MAX || (flags & NILFS_BTREE_NODE_ROOT) || - nchildren < 0 || + nchildren <= 0 || nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) { nilfs_crit(inode->i_sb, "bad btree node (ino=%lu, blocknr=%llu): level = %d, flags = 0x%x, nchildren = %d", |