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fs/ntfs3: Fix case when index is reused during tree transformation

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commit 05afeeebcac850a016ec4fb1f681ceda11963562 upstream.

In most cases when adding a cluster to the directory index,
they are placed at the end, and in the bitmap, this cluster corresponds
to the last bit. The new directory size is calculated as follows:

	data_size = (u64)(bit + 1) << indx->index_bits;

In the case of reusing a non-final cluster from the index,
data_size is calculated incorrectly, resulting in the directory size
differing from the actual size.

A check for cluster reuse has been added, and the size update is skipped.

Fixes: 82cae269cf ("fs/ntfs3: Add initialization of super block")
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Konstantin Komarov 2024-04-23 15:31:56 +03:00 • committed by Greg Kroah-Hartman
parent e4fd2dce71
commit 84906740dc
1 changed files with 6 additions and 0 deletions
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6
fs/ntfs3/index.c
View file

@ -1533,6 +1533,11 @@ static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
goto out1;
}
if (data_size <= le64_to_cpu(alloc->nres.data_size)) {
/* Reuse index. */
goto out;
}
/* Increase allocation. */
err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
&indx->alloc_run, data_size, &data_size, true,
@ -1546,6 +1551,7 @@ static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
if (in->name == I30_NAME)
i_size_write(&ni->vfs_inode, data_size);
out:
*vbn = bit << indx->idx2vbn_bits;
return 0;