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fs/ntfs3: Check for extremely large size of $AttrDef

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Added additional checking for size of $AttrDef.
Added comment.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2022-12-29 15:58:56 +04:00
parent 0addfb1c22
commit 318d016e42
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1 changed files with 9 additions and 1 deletions
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10
fs/ntfs3/super.c
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@ -1185,10 +1185,18 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
goto out;
}
if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY)) {
/*
* Typical $AttrDef contains up to 20 entries.
* Check for extremely large size.
*/
if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) ||
inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) {
ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).",
inode->i_size);
err = -EINVAL;
goto put_inode_out;
}
bytes = inode->i_size;
sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN);
if (!t) {