[PATCH 6.2 619/663] nilfs2: fix infinite loop in nilfs_mdt_get_block()

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From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>

commit a6a491c048882e7e424d407d32cba0b52d9ef2bf upstream.

If the disk image that nilfs2 mounts is corrupted and a virtual block
address obtained by block lookup for a metadata file is invalid,
nilfs_bmap_lookup_at_level() may return the same internal return code as
-ENOENT, meaning the block does not exist in the metadata file.

This duplication of return codes confuses nilfs_mdt_get_block(), causing
it to read and create a metadata block indefinitely.

In particular, if this happens to the inode metadata file, ifile,
semaphore i_rwsem can be left held, causing task hangs in lock_mount.

Fix this issue by making nilfs_bmap_lookup_at_level() treat virtual block
address translation failures with -ENOENT as metadata corruption instead
of returning the error code.

Link: https://lkml.kernel.org/r/20230430193046.6769-1-konishi.ryusuke@xxxxxxxxx
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Reported-by: syzbot+221d75710bde87fa0e97@xxxxxxxxxxxxxxxxxxxxxxxxx
  Link: https://syzkaller.appspot.com/bug?extid=221d75710bde87fa0e97
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nilfs2/bmap.c |   16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

--- a/fs/nilfs2/bmap.c
+++ b/fs/nilfs2/bmap.c
@@ -67,20 +67,28 @@ int nilfs_bmap_lookup_at_level(struct ni
 
 	down_read(&bmap->b_sem);
 	ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
-	if (ret < 0) {
-		ret = nilfs_bmap_convert_error(bmap, __func__, ret);
+	if (ret < 0)
 		goto out;
-	}
+
 	if (NILFS_BMAP_USE_VBN(bmap)) {
 		ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
 					  &blocknr);
 		if (!ret)
 			*ptrp = blocknr;
+		else if (ret == -ENOENT) {
+			/*
+			 * If there was no valid entry in DAT for the block
+			 * address obtained by b_ops->bop_lookup, then pass
+			 * internal code -EINVAL to nilfs_bmap_convert_error
+			 * to treat it as metadata corruption.
+			 */
+			ret = -EINVAL;
+		}
 	}
 
  out:
 	up_read(&bmap->b_sem);
-	return ret;
+	return nilfs_bmap_convert_error(bmap, __func__, ret);
 }
 
 int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,





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