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 340FD3BCD05; Thu, 16 Jul 2026 14:10:28 +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=1784211029; cv=none; b=KOTvjHVAouliGBoS1QK/TtJiRpfDPmwpwhfEiJSDrNcZbKHnl0xlZQlXSKZXCJ3cHNb5VQGRrO6ebYd7bN7iF4NvAmf9byRCC4Cd24svW4XGuuI/kh9DuAuDfLJp7HlB0SlXDqBDEeHRCmytxFWK482ShG8xQ4Pgx6dDY9E/14E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784211029; c=relaxed/simple; bh=lw/4WPkVPbc1Ob0bwVIKifTEzkrISmMH09DeBVZg0xc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eH2z89tMgYiC4WvugRuP5qD+SwscpZsfmeTjiKRlbdG20of1+hxyYCrqYxJU/tpLWyIdGsT524aDKMDAARMWrO2ynNo8aNDa444xssTB3KuBoziPhC+I4ivvxoTRlELXHyCJsFzDVKCPy0abKNhbZa/CFY/SDahGQ8R8yMoSQUc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=i+wgVSnu; 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="i+wgVSnu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E8CE1F000E9; Thu, 16 Jul 2026 14:10:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784211028; bh=p+ecyyDJOVSwJ3itk5ZVNknn32YVnsNMqD9/3eqGKdI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=i+wgVSnuc6AxJ80x3j4zESynz8dcFj4twQv8X+wlyqd+stx1J5bqYr9yWDdG8e8HR LI5ZfcnBRftw4oSvWlUJnPBhxAN9FW/uEtQRJ1kv9RyYvXsVPFZjnniYLqg8hTkrH5 7WSGrbebPvUuca9P6lhkmaG9LLwmByavdMgw5FHE= 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 6.18 270/480] hfs/hfsplus: zero-initialize buffer in hfs_bnode_read Date: Thu, 16 Jul 2026 15:30:17 +0200 Message-ID: <20260716133050.663731271@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133044.672218725@linuxfoundation.org> References: <20260716133044.672218725@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 6.18-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;