linux-kernel - [PATCH 4.19 04/86] udf: Restore i_lenAlloc when inode expansion fails

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Date:   Mon,  7 Feb 2022 12:05:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, butt3rflyh4ck <butterflyhuangxx@...il.com>,
        Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.cz>
Subject: [PATCH 4.19 04/86] udf: Restore i_lenAlloc when inode expansion fails

From: Jan Kara <jack@...e.cz>

commit ea8569194b43f0f01f0a84c689388542c7254a1f upstream.

When we fail to expand inode from inline format to a normal format, we
restore inode to contain the original inline formatting but we forgot to
set i_lenAlloc back. The mismatch between i_lenAlloc and i_size was then
causing further problems such as warnings and lost data down the line.

Reported-by: butt3rflyh4ck <butterflyhuangxx@...il.com>
CC: stable@...r.kernel.org
Fixes: 7e49b6f2480c ("udf: Convert UDF to new truncate calling sequence")
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/udf/inode.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -311,6 +311,7 @@ int udf_expand_file_adinicb(struct inode
 		unlock_page(page);
 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 		inode->i_data.a_ops = &udf_adinicb_aops;
+		iinfo->i_lenAlloc = inode->i_size;
 		up_write(&iinfo->i_data_sem);
 	}
 	put_page(page);