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udf: Fix directory iteration for longer tail extents

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commit 1ea1cd11c7 upstream.

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>
Cc: Shreenidhi Shedi <yesshedi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kara 2023-01-25 11:43:03 +01:00 committed by Greg Kroah-Hartman
parent 91542d131b
commit 6c450489f9
1 changed files with 1 additions and 1 deletions
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fs/udf/directory.c
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@ -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;