From 1ea1cd11c72d1405a6b98440a9d5ea82dfa07166 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Wed, 25 Jan 2023 11:43:03 +0100
Subject: [PATCH] udf: Fix directory iteration for longer tail extents
When directory's last extent has more that one block and its length is
not multiple of a block side, the code wrongly decided to move to the
next extent instead of processing the last partial block. This led to
directory corruption. Fix the rounding issue.
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/udf/directory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index b1424e2aa8682..31f1bf8ab8481 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -170,7 +170,7 @@ static struct buffer_head *udf_fiiter_bread_blk(struct udf_fileident_iter *iter)
static int udf_fiiter_advance_blk(struct udf_fileident_iter *iter)
{
iter->loffset++;
- if (iter->loffset < iter->elen >> iter->dir->i_blkbits)
+ if (iter->loffset < DIV_ROUND_UP(iter->elen, 1<<iter->dir->i_blkbits))
return 0;
iter->loffset = 0;
--
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