From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f200.google.com (mail-oi1-f200.google.com [209.85.167.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6804A302140 for ; Fri, 17 Apr 2026 16:21:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776442869; cv=none; b=XvWwmXpKEzBtT0zAzzlxPlbtVExdy+RA5O0tYR1HVSpQMv1IxBInYkdgvYtGz18XIgnuHjGB9r52OXLzDvD26laQD4GkJMl6Frvdui6z/SZwP8vytW4Fv03LbzoOkxHgcW/h7eVbjJBWWZVLIP3ffYHooomrOsub1TS87oCYsmQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776442869; c=relaxed/simple; bh=d9RxKlRVE4/du5YZlH55WoKph3xmyhWPy9cxrFXuXak=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=HDHKV9fbA2qB+tRtFIGWjDJsn4r1iI9Nq9KeTLiQznfc/L7vveV3450HnjwGstI2e7Q0VJJDgWX3z/noVoRFfGMP/vdd4hbDplbuvp0atoiaCMYpP5RrZqsyr6hzzLSYKLqpvmaxma6EVOVBF2J3WmxXo/VDeCzd3vaBrachpNk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f200.google.com with SMTP id 5614622812f47-475f6d0de69so1520100b6e.1 for ; Fri, 17 Apr 2026 09:21:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776442867; x=1777047667; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=arJVQnezx7T+YSro++wgg2f77BTv/caaKMDvjpM78O0=; b=gJXM9n5MhTnJFzud7wOjNRDk/THjKowc4rGvBENmh2Pqy8ECHrh4FO0Si/rmA1RYGm ni1la+2dn/L/sP7FvN4kwmyv3KmHeA5kbDOc9/0JUX61TCSTyf8OE+lAD66NjWGAQ/4z MyiQ/GbeEWPE+CXjSrawEWWRXfuwG3nybKkQD4j3agL1BuGQSLlrjYEOq2fJ9HGP0uHa 7/JTKGIKcmaTMDBAj4E0+g9VKgrmIEi4+Gx2owbt+cVqFMvK2eyZ1QLGck1Ohr8omQO/ dsfdegB84b/MVULBYOlyTbmSV5GFwe3P6iKaleD/Jq355fQvpATb2srEEh8YTmOJyiuw wzoQ== X-Gm-Message-State: AOJu0YzlQ11//w2dhg6MbjtIuoWCj4usznXv0jebv6pfZ0jGq/InAj5H OXoy2kGfuV8cQS/0SQlEZ6zijQi7je1vkvJEf1njMDBNfaVfzHfRaEU83uwtXAc289mXEYEycoo EvrS0WPrzBgksNDt8LSSP1rpDng3d8hYQeXGhuZGS+mubvfcQbLC/BE4QPTo= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2089:b0:67c:2fe3:7edf with SMTP id 006d021491bc7-69462f2f15cmr2038334eaf.52.1776442867416; Fri, 17 Apr 2026 09:21:07 -0700 (PDT) Date: Fri, 17 Apr 2026 09:21:07 -0700 In-Reply-To: <69decbd0.a00a0220.468cb.006b.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e25df3.050a0220.1de265.002b.GAE@google.com> Subject: Forwarded: Re: [syzbot] KMSAN: uninit-value in hfs_bnode_read_u16 From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] KMSAN: uninit-value in hfs_bnode_read_u16 Author: tristmd@gmail.com #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master >>From 22a2a76dffd13b9a5bf3e41e13382714f3ffb459 Mon Sep 17 00:00:00 2001 From: Tristan Madani Date: Fri, 17 Apr 2026 16:15:17 +0000 Subject: [PATCH] hfsplus: initialize data in hfs_bnode_read_u16 and hfs_bnode_read_u8 hfs_bnode_read_u16() and hfs_bnode_read_u8() declare local data variables without initialization. If hfs_bnode_read() fails to fully populate them (e.g., due to a corrupted node), the stale stack values are returned, triggering KMSAN uninit-value. Zero-initialize both variables. Reported-by: syzbot+217eb327242d08197efb@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=217eb327242d08197efb Signed-off-by: Tristan Madani --- fs/hfsplus/bnode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/hfsplus/bnode.c b/fs/hfsplus/bnode.c index f8b5a8a..3579008 100644 --- a/fs/hfsplus/bnode.c +++ b/fs/hfsplus/bnode.c @@ -55,7 +55,7 @@ void hfs_bnode_read(struct hfs_bnode *node, void *buf, u32 off, u32 len) u16 hfs_bnode_read_u16(struct hfs_bnode *node, u32 off) { - __be16 data; + __be16 data = 0; /* TODO: optimize later... */ hfs_bnode_read(node, &data, off, 2); return be16_to_cpu(data); @@ -63,7 +63,7 @@ u16 hfs_bnode_read_u16(struct hfs_bnode *node, u32 off) u8 hfs_bnode_read_u8(struct hfs_bnode *node, u32 off) { - u8 data; + u8 data = 0; /* TODO: optimize later... */ hfs_bnode_read(node, &data, off, 1); return data; -- 2.47.3