From patchwork Fri Oct 28 08:09:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhi Li X-Patchwork-Id: 13023200 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 066BFECAAA1 for ; Fri, 28 Oct 2022 08:11:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229744AbiJ1ILL (ORCPT ); Fri, 28 Oct 2022 04:11:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229542AbiJ1ILJ (ORCPT ); Fri, 28 Oct 2022 04:11:09 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0D3D52E6B for ; Fri, 28 Oct 2022 01:10:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666944613; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=g5oM+pS1i7LJO/8MBRo3XO+oDgdVL+ZwZwWMM7q2JIw=; b=cKLL0YFVh9hRwOylnz0GhCiKP3z4VxvBmjcOnRDtHC33V0Loy2JzSDh51vA6WNraoh2Pqn 1bzIFXcw12WLIuLqiL14tavTYeQWM7SX2MLK8B2qr0+dm/30beBG99GU5VTY8aU+hBkZuo 7KhgCItiJlPJC6F7rjjAihm37/4afPU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-454-mgwQpP3tOoasAeoJDIG6hQ-1; Fri, 28 Oct 2022 04:10:11 -0400 X-MC-Unique: mgwQpP3tOoasAeoJDIG6hQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C2FD93804069 for ; Fri, 28 Oct 2022 08:10:10 +0000 (UTC) Received: from localhost (unknown [10.66.60.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 24FD4477F5C; Fri, 28 Oct 2022 08:10:09 +0000 (UTC) From: Zhi Li To: linux-nfs@vger.kernel.org Cc: steved@redhat.com, Zhi Li Subject: [PATCH] [nfs/nfs-utils/libtirpc] clnt_raw.c: fix a possible null pointer dereference Date: Fri, 28 Oct 2022 16:09:58 +0800 Message-Id: <20221028080958.236130-1-yieli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Since clntraw_private could be dereferenced before allocated, protect it by checking its value in advance. Signed-off-by: Zhi Li --- src/clnt_raw.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/clnt_raw.c b/src/clnt_raw.c index 31f9d0c..03f839d 100644 --- a/src/clnt_raw.c +++ b/src/clnt_raw.c @@ -142,7 +142,7 @@ clnt_raw_call(h, proc, xargs, argsp, xresults, resultsp, timeout) struct timeval timeout; { struct clntraw_private *clp = clntraw_private; - XDR *xdrs = &clp->xdr_stream; + XDR *xdrs; struct rpc_msg msg; enum clnt_stat status; struct rpc_err error; @@ -154,6 +154,7 @@ clnt_raw_call(h, proc, xargs, argsp, xresults, resultsp, timeout) mutex_unlock(&clntraw_lock); return (RPC_FAILED); } + xdrs = &clp->xdr_stream; mutex_unlock(&clntraw_lock); call_again: @@ -245,7 +246,7 @@ clnt_raw_freeres(cl, xdr_res, res_ptr) void *res_ptr; { struct clntraw_private *clp = clntraw_private; - XDR *xdrs = &clp->xdr_stream; + XDR *xdrs; bool_t rval; mutex_lock(&clntraw_lock); @@ -254,6 +255,7 @@ clnt_raw_freeres(cl, xdr_res, res_ptr) mutex_unlock(&clntraw_lock); return (rval); } + xdrs = &clp->xdr_stream; mutex_unlock(&clntraw_lock); xdrs->x_op = XDR_FREE; return ((*xdr_res)(xdrs, res_ptr));