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fs/ntfs3: Update log->page_{mask,bits} if log->page_size changed

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commit 2fef55d8f7 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@vger.kernel.org
Fixes: b46acd6a6a ("fs/ntfs3: Add NTFS journal")
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huacai Chen
2024-05-29 14:40:52 +08:00
committed by Greg Kroah-Hartman
parent c719b39337
commit 0484adcb5f
1 changed files with 3 additions and 0 deletions
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fs/ntfs3/fslog.c
+3
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@@ -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;