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fs/ntfs3: Refactoring of ntfs_set_ea

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Make code more readable.
Don't try to read zero bytes.
Add warning when size of exteneded attribute exceeds limit.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2021-09-24 17:53:56 +03:00
parent d81e06be92
commit cff32466bf
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GPG Key ID: A9B0331F832407B6
1 changed files with 17 additions and 14 deletions
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31
fs/ntfs3/xattr.c
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@ -75,6 +75,7 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
size_t add_bytes, const struct EA_INFO **info)
{
int err;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct ATTR_LIST_ENTRY *le = NULL;
struct ATTRIB *attr_info, *attr_ea;
void *ea_p;
@ -99,10 +100,10 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
/* Check Ea limit. */
size = le32_to_cpu((*info)->size);
if (size > ni->mi.sbi->ea_max_size)
if (size > sbi->ea_max_size)
return -EFBIG;
if (attr_size(attr_ea) > ni->mi.sbi->ea_max_size)
if (attr_size(attr_ea) > sbi->ea_max_size)
return -EFBIG;
/* Allocate memory for packed Ea. */
@ -110,15 +111,16 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
if (!ea_p)
return -ENOMEM;
if (attr_ea->non_res) {
if (!size) {
;
} else if (attr_ea->non_res) {
struct runs_tree run;
run_init(&run);
err = attr_load_runs(attr_ea, ni, &run, NULL);
if (!err)
err = ntfs_read_run_nb(ni->mi.sbi, &run, 0, ea_p, size,
NULL);
err = ntfs_read_run_nb(sbi, &run, 0, ea_p, size, NULL);
run_close(&run);
if (err)
@ -366,21 +368,22 @@ static noinline int ntfs_set_ea(struct inode *inode, const char *name,
new_ea->name[name_len] = 0;
memcpy(new_ea->name + name_len + 1, value, val_size);
new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
/* Should fit into 16 bits. */
if (new_pack > 0xffff) {
err = -EFBIG; // -EINVAL?
goto out;
}
ea_info.size_pack = cpu_to_le16(new_pack);
/* New size of ATTR_EA. */
size += add;
if (size > sbi->ea_max_size) {
ea_info.size = cpu_to_le32(size);
/*
* 1. Check ea_info.size_pack for overflow.
* 2. New attibute size must fit value from $AttrDef
*/
if (new_pack > 0xffff || size > sbi->ea_max_size) {
ntfs_inode_warn(
inode,
"The size of extended attributes must not exceed 64KiB");
err = -EFBIG; // -EINVAL?
goto out;
}
ea_info.size = cpu_to_le32(size);
update_ea: