From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57685C433EF for ; Tue, 5 Jul 2022 12:00:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232788AbiGEMAJ (ORCPT ); Tue, 5 Jul 2022 08:00:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232700AbiGEMAE (ORCPT ); Tue, 5 Jul 2022 08:00:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FC5517E1B; Tue, 5 Jul 2022 04:59:53 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0CD96617B1; Tue, 5 Jul 2022 11:59:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19755C341C7; Tue, 5 Jul 2022 11:59:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1657022392; bh=edsKe0FVOvsRAYwbS5XjA2Hdnp3PFY86vrBZUlfMG/g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZtOJqFpoR3naKG3/umhGm7DDnU+GUiDE8pN2OmSRwjv1jGpKPgDKAfiO9TlgSbzo4 p4Od0PGzEI+Uu8+hdQPxx6Bw2owtyMq9GrM+9oq+Fcy34fJNSwmndDeIeNhuSnXmwI kZLTVe8Xjq2panhlbLRombNA1XX7qNZ+KYADTok8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bruce Fields , Zorro Lang , Chuck Lever Subject: [PATCH 4.9 02/29] SUNRPC: Fix READ_PLUS crasher Date: Tue, 5 Jul 2022 13:57:43 +0200 Message-Id: <20220705115605.816369937@linuxfoundation.org> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220705115605.742248854@linuxfoundation.org> References: <20220705115605.742248854@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chuck Lever commit a23dd544debcda4ee4a549ec7de59e85c3c8345c upstream. Looks like there are still cases when "space_left - frag1bytes" can legitimately exceed PAGE_SIZE. Ensure that xdr->end always remains within the current encode buffer. Reported-by: Bruce Fields Reported-by: Zorro Lang Link: https://bugzilla.kernel.org/show_bug.cgi?id=216151 Fixes: 6c254bf3b637 ("SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer()") Signed-off-by: Chuck Lever Signed-off-by: Greg Kroah-Hartman --- net/sunrpc/xdr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -544,7 +544,7 @@ static __be32 *xdr_get_next_encode_buffe */ xdr->p = (void *)p + frag2bytes; space_left = xdr->buf->buflen - xdr->buf->len; - if (space_left - nbytes >= PAGE_SIZE) + if (space_left - frag1bytes >= PAGE_SIZE) xdr->end = (void *)p + PAGE_SIZE; else xdr->end = (void *)p + space_left - frag1bytes;