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Subject[PATCH 2/3] fs/ntfs3: Check reserved size for maximum allowed
From
Also don't mask EFBIG
Fixes xfstest generic/485
Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---
fs/ntfs3/attrib.c | 11 ++++++++++-
fs/ntfs3/file.c | 3 ---
2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index bea0e70e974a..3bd51cf4d8bd 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -2114,9 +2114,11 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)

if (!attr_b->non_res) {
data_size = le32_to_cpu(attr_b->res.data_size);
+ alloc_size = data_size;
mask = sbi->cluster_mask; /* cluster_size - 1 */
} else {
data_size = le64_to_cpu(attr_b->nres.data_size);
+ alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
}

@@ -2130,6 +2132,13 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
return -EINVAL;
}

+ /*
+ * valid_size <= data_size <= alloc_size
+ * Check alloc_size for maximum possible.
+ */
+ if (bytes > sbi->maxbytes_sparse - alloc_size)
+ return -EFBIG;
+
vcn = vbo >> sbi->cluster_bits;
len = bytes >> sbi->cluster_bits;

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 5ee035e42c21..de37d5c1d60b 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -732,9 +732,6 @@ static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
if (map_locked)
filemap_invalidate_unlock(mapping);

- if (err == -EFBIG)
- err = -ENOSPC;
-
if (!err) {
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
--
2.36.1

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