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ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr()

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Here is a BUG report from syzbot:

BUG: KASAN: slab-out-of-bounds in ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
BUG: KASAN: slab-out-of-bounds in ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
Read of size 1 at addr ffff888021acaf3d by task syz-executor128/3632

Call Trace:
 ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
 ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x293/0x2d0 fs/xattr.c:804

Fix the logic of ea_all iteration. When the ea->name_len is 0,
return immediately, or Add2Ptr() would visit invalid memory
in the next loop.

Fixes: be71b5cba2 ("fs/ntfs3: Add attrib operations")
Reported-by: syzbot+9fcea5ef6dc4dc72d334@syzkaller.appspotmail.com
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
[almaz.alexandrovich@paragon-software.com: lines of the patch have changed]
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Zeng Heng 2022-12-08 00:28:07 +08:00 committed by Konstantin Komarov
parent 6995e2de68
commit 3c675ddffb
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1 changed files with 3 additions and 0 deletions
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3
fs/ntfs3/xattr.c
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@ -214,6 +214,9 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
ea = Add2Ptr(ea_all, off);
ea_size = unpacked_ea_size(ea);
if (!ea->name_len)
break;
if (buffer) {
if (ret + ea->name_len + 1 > bytes_per_buffer) {
err = -ERANGE;