From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 D782D3C5523; Tue, 21 Jul 2026 21:13:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784668393; cv=none; b=Bd1h7DjjMJzEGf7phkyTYSYRHBzS8BHhRAF0eppZ6e/yfs2eKQ1HaxAVos7KQCAKjRFGCyAxV1986kcHKTxuCBdVuyWLvJ9OyP4XgBMhKVIg6zHYaDAZh6d8actCEg1mkrHXwuyUKfEs0PIhyKPY/839Qcmm1KfYrReJY8zNy/g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784668393; c=relaxed/simple; bh=fuvz8fIk49NgbA/ikXl8jDA3jcIWYPk55bdj63hokWw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I1geYZpSDqpozcrWZpYOyq5zhZg3D3k1tUIfO5dd97lPDn5ZRjmwWCGxrTJ1/NRM4W97FxVp9io9wRL2THgwOkGUJaYQCEUUauA0kSaIXPgioChimvOVaIuKBifoYrVmZBc6BdiigVaS6jZ1UauGXF7yCnrO5FcCKzi7yDP2JTA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BMmYlyYx; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="BMmYlyYx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E02931F00A3A; Tue, 21 Jul 2026 21:13:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784668391; bh=XpcCSdVckEZxa7GF+fTOXtwaUT9MpBqckL1m28XUzmM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BMmYlyYxwBqFVNfLtzrJVIt9xetFQufckP4gwvPKrnrEEBVjQfwFdO1vNMdrfM25t ID+ODYGsIt+Vvdi2qKi/ecvPwXbFGJ7kG5b0e8knp48Od0YInC0r9ucQU7+KxUJ4ze 4KzH9YIYJPXVmmuGvtpOr+JjXzrRG9WXobdYATYA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+217eb327242d08197efb@syzkaller.appspotmail.com, Tristan Madani , Viacheslav Dubeyko Subject: [PATCH 6.1 0159/1067] hfs/hfsplus: zero-initialize buffer in hfs_bnode_read Date: Tue, 21 Jul 2026 17:12:40 +0200 Message-ID: <20260721152428.146166011@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152424.521567757@linuxfoundation.org> References: <20260721152424.521567757@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tristan Madani commit d67aadee19ffdf3cc8520c5a4f4d5b2916d30baf upstream. hfs_bnode_read() can return early without writing to the output buffer when is_bnode_offset_valid() fails or when check_and_correct_requested_ length() corrects the length to zero. Callers such as hfs_bnode_read_ u16() and hfs_bnode_read_u8() pass stack-allocated buffers and use the result unconditionally, leading to KMSAN uninit-value reports. Rather than initializing at each individual call site, zero the buffer at the start of hfs_bnode_read() before any validation checks. This ensures all callers in both hfs and hfsplus get a deterministic zero value regardless of which early-return path is taken. Reported-by: syzbot+217eb327242d08197efb@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=217eb327242d08197efb Tested-by: syzbot+217eb327242d08197efb@syzkaller.appspotmail.com Fixes: a431930c9bac ("hfs: fix slab-out-of-bounds in hfs_bnode_read()") Cc: stable@vger.kernel.org Signed-off-by: Tristan Madani Reviewed-by: Viacheslav Dubeyko Signed-off-by: Viacheslav Dubeyko Link: https://lore.kernel.org/r/20260505111300.3592757-3-tristmd@gmail.com Signed-off-by: Viacheslav Dubeyko Signed-off-by: Greg Kroah-Hartman --- fs/hfs/bnode.c | 2 ++ fs/hfsplus/bnode.c | 2 ++ 2 files changed, 4 insertions(+) --- a/fs/hfs/bnode.c +++ b/fs/hfs/bnode.c @@ -64,6 +64,8 @@ void hfs_bnode_read(struct hfs_bnode *no int bytes_read; int bytes_to_read; + memset(buf, 0, len); + if (!is_bnode_offset_valid(node, off)) return; --- a/fs/hfsplus/bnode.c +++ b/fs/hfsplus/bnode.c @@ -25,6 +25,8 @@ void hfs_bnode_read(struct hfs_bnode *no struct page **pagep; int l; + memset(buf, 0, len); + if (!is_bnode_offset_valid(node, off)) return;