From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CB8C8F5B for ; Sun, 16 Jul 2023 20:26:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C2BAC433C7; Sun, 16 Jul 2023 20:26:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689539212; bh=N4CVBkMxDrtiSX+ZatOSbQiYI1jf/jVkmPCvSlcFw/E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m0oqAWV1dox7gES4UH9Ejr+huUaIK69HgOlnAHq26rJ+dXBboBtmyN2Gpo6pVhs95 1VwyIRyBBAcpZ77+dRrrIsoZeEDHJGa5vGpyM7jR/fDaL3qIhe4LWcpDFE5CGPQO4E RslcZSnBxDbL5XUnhlrCAmXsfmb/318vjHdg12NU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+9fcea5ef6dc4dc72d334@syzkaller.appspotmail.com, Zeng Heng , Konstantin Komarov , Sasha Levin Subject: [PATCH 6.4 688/800] ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr() Date: Sun, 16 Jul 2023 21:49:01 +0200 Message-ID: <20230716195005.105417401@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230716194949.099592437@linuxfoundation.org> References: <20230716194949.099592437@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Zeng Heng [ 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 [almaz.alexandrovich@paragon-software.com: lines of the patch have changed] Signed-off-by: Konstantin Komarov Signed-off-by: Sasha Levin --- fs/ntfs3/xattr.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c index c3de60a4543fa..fd02fcf4d4091 100644 --- a/fs/ntfs3/xattr.c +++ b/fs/ntfs3/xattr.c @@ -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; -- 2.39.2