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| author | Zeng Heng <zengheng4@huawei.com> | 2022-12-08 00:28:07 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-19 16:22:04 +0200 |
| commit | c86a2517df6c9304db8fb12b77136ec7a5d85994 (patch) | |
| tree | 8632e8fa130133a0e9c134a6598f3c995129cdda /fs/ntfs3 | |
| parent | a5485a943193e55c79150382e6461e8ea759e96e (diff) | |
| download | linux-c86a2517df6c9304db8fb12b77136ec7a5d85994.tar.gz | |
ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr()
[ Upstream commit 3c675ddffb17a8b1e32efad5c983254af18b12c2 ]
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: be71b5cba2e6 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/ntfs3')
| -rw-r--r-- | fs/ntfs3/xattr.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c index ea582b4fe1d9..88866bcd1a21 100644 --- a/fs/ntfs3/xattr.c +++ b/fs/ntfs3/xattr.c @@ -178,6 +178,9 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer, for (ret = 0, off = 0; off < size; off += unpacked_ea_size(ea)) { ea = Add2Ptr(ea_all, off); + if (!ea->name_len) + break; + if (buffer) { if (ret + ea->name_len + 1 > bytes_per_buffer) { err = -ERANGE; |