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fs/ntfs3: Reject mount if boot's cluster size < media sector size

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If we continue to work in this case, then we can corrupt fs.
Fixes: 82cae269cf ("fs/ntfs3: Add initialization of super block").

Reviewed-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2021-09-28 19:19:17 +03:00
parent 66019837a5
commit 09f7c338da
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1 changed files with 12 additions and 1 deletions
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13
fs/ntfs3/super.c
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@ -763,9 +763,20 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
sbi->mft.lbo = mlcn << sbi->cluster_bits;
sbi->mft.lbo2 = mlcn2 << sbi->cluster_bits;
if (sbi->cluster_size < sbi->sector_size)
/* Compare boot's cluster and sector. */
if (sbi->cluster_size < boot_sector_size)
goto out;
/* Compare boot's cluster and media sector. */
if (sbi->cluster_size < sector_size) {
/* No way to use ntfs_get_block in this case. */
ntfs_err(
sb,
"Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u)",
sbi->cluster_size, sector_size);
goto out;
}
sbi->cluster_mask = sbi->cluster_size - 1;
sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
sbi->record_size = record_size = boot->record_size < 0