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f2fs: fix to do sanity check in is_alive()

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In fuzzed image, SSA table may indicate that a data block belongs to
invalid node, which node ID is out-of-range (0, 1, 2 or max_nid), in
order to avoid migrating inconsistent data in such corrupted image,
let's do sanity check anyway before data block migration.

Cc: stable@vger.kernel.org
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2021-12-06 22:44:21 +08:00 committed by Jaegeuk Kim
parent f6db43076d
commit 77900c45ee
1 changed files with 3 additions and 0 deletions
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3
fs/f2fs/gc.c
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@ -1026,6 +1026,9 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
set_sbi_flag(sbi, SBI_NEED_FSCK);
}
if (f2fs_check_nid_range(sbi, dni->ino))
return false;
*nofs = ofs_of_node(node_page);
source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
f2fs_put_page(node_page, 1);