diff options
| author | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2025-09-18 13:35:24 +0300 |
|---|---|---|
| committer | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2025-10-17 12:08:43 +0200 |
| commit | 801f614ba263cb37624982b27b4c82f3c3c597a9 (patch) | |
| tree | cf1834910b784b4f4549082fed00bbb4107d266e | |
| parent | a846cd0d0a05364c6fa5c4988e75d3b639d6dae5 (diff) | |
fs/ntfs3: fix mount failure for sparse runs in run_unpack()
Some NTFS volumes failed to mount because sparse data runs were not
handled correctly during runlist unpacking. The code performed arithmetic
on the special SPARSE_LCN64 marker, leading to invalid LCN values and
mount errors.
Add an explicit check for the case described above, marking the run as
sparse without applying arithmetic.
Fixes: 736fc7bf5f68 ("fs: ntfs3: Fix integer overflow in run_unpack()")
Cc: stable@vger.kernel.org
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
| -rw-r--r-- | fs/ntfs3/run.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ntfs3/run.c b/fs/ntfs3/run.c index 88550085f745..5df55e4adbb1 100644 --- a/fs/ntfs3/run.c +++ b/fs/ntfs3/run.c @@ -984,8 +984,12 @@ int run_unpack(struct runs_tree *run, struct ntfs_sb_info *sbi, CLST ino, if (!dlcn) return -EINVAL; - if (check_add_overflow(prev_lcn, dlcn, &lcn)) + /* Check special combination: 0 + SPARSE_LCN64. */ + if (!prev_lcn && dlcn == SPARSE_LCN64) { + lcn = SPARSE_LCN64; + } else if (check_add_overflow(prev_lcn, dlcn, &lcn)) { return -EINVAL; + } prev_lcn = lcn; } else { /* The size of 'dlcn' can't be > 8. */ |