5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara jack@suse.cz
commit 1ea1cd11c72d1405a6b98440a9d5ea82dfa07166 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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/udf/directory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/udf/directory.c +++ b/fs/udf/directory.c @@ -171,7 +171,7 @@ static struct buffer_head *udf_fiiter_br 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;