[PATCH 5.15 211/484] fs/ntfs3: Update log->page_{mask,bits} if log->page_size changed

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Huacai Chen <chenhuacai@xxxxxxxxxxx>

commit 2fef55d8f78383c8e6d6d4c014b9597375132696 upstream.

If an NTFS file system is mounted to another system with different
PAGE_SIZE from the original system, log->page_size will change in
log_replay(), but log->page_{mask,bits} don't change correspondingly.
This will cause a panic because "u32 bytes = log->page_size - page_off"
will get a negative value in the later read_log_page().

Cc: stable@xxxxxxxxxxxxxxx
Fixes: b46acd6a6a627d876898e ("fs/ntfs3: Add NTFS journal")
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ntfs3/fslog.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/ntfs3/fslog.c
+++ b/fs/ntfs3/fslog.c
@@ -3935,6 +3935,9 @@ init_log_instance:
 		goto out;
 	}
 
+	log->page_mask = log->page_size - 1;
+	log->page_bits = blksize_bits(log->page_size);
+
 	/* If the file size has shrunk then we won't mount it. */
 	if (l_size < le64_to_cpu(ra2->l_size)) {
 		err = -EINVAL;






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