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 E2849394783; Tue, 21 Jul 2026 20:20:09 +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=1784665211; cv=none; b=f+YJzcZ0V0HWfeyW8JG6HuYZIng+iM4RlL5qtxejiIPbhSAlJFhVz0fwXKzsxYJ3SIpePK2dEdAaD6w4CWplINg7cjX8IWLuHK7KoSZpfJ5iMB5dZh90+6dK+NDADBwC+ngvNWTAorlVelUaF/6ybX1MbP2Mz7KL9GaR6L4SIGA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665211; c=relaxed/simple; bh=bGheoGdO0KSvIdU/2nJ4LDT2fBaTASqvo8fU/T/1TCI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rC7OGXpYB+opIsSKTTVu5OGh9HolVIKDqOLxqkfx41VV4xJNzTbktB5iZ2Nu+v2mZRZFFAAzPCXimurY6DmmVYKUTg+p+3QWLNQnzcHxnK+8kcMkjoZdAhLwb3jnc1lOuwM7AIrriLIzU2eLhR62S/ioPm0u0JoiD9CaeHxANik= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=IR7kiKnD; 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="IR7kiKnD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4CCF31F00A3F; Tue, 21 Jul 2026 20:20:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784665209; bh=gqBK7gwobFYbN7QnYhZCIDkkgXjLShfT3djlXy8Rohw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IR7kiKnDKl7VDEw4Hxp6yvayG/mz0SA9QtuG+8uq5Y0Zw7icPddWfJNyGUTKRL2Bn qJXN1XToZenEZuSY/KDU27kFn5JgTOIGhaUz1lplee9ziIJl5hU+i4QgVIyhe9w+Ap 6UhjTMb0bHLRqdG8ZKfsfFpCpVrWjVjQO04NYCFY= 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 6.6 0217/1266] hfs/hfsplus: zero-initialize buffer in hfs_bnode_read Date: Tue, 21 Jul 2026 17:10:54 +0200 Message-ID: <20260721152446.675077296@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152441.786066624@linuxfoundation.org> References: <20260721152441.786066624@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 6.6-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;