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 D6E44E936F1 for ; Thu, 5 Oct 2023 00:05:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241171AbjJEAFr (ORCPT ); Wed, 4 Oct 2023 20:05:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244177AbjJEAFq (ORCPT ); Wed, 4 Oct 2023 20:05:46 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E7879E for ; Wed, 4 Oct 2023 17:05:43 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 4A2111F38A; Thu, 5 Oct 2023 00:05:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1696464341; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5B30aNuZqZAiEZ7O9e1YmL85qRMVmxV+iueEhBdsGDo=; b=IpCtW36lgs0RvCAVqPb1uQTdzEfTXI8FuX7PK9bdsBBqn82bw+UfFMg7q3Uy4hjOk2bcWX pJHdb95sjRapTVMdyJvPiSOGfkyS2qXTw6lLrNH7NFLMnNhhr9iJhm7ZjiJPlPwu7Z/5BN DWPfodVTmzsg99sBoC7Q3QdzKvFu9yk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1696464341; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5B30aNuZqZAiEZ7O9e1YmL85qRMVmxV+iueEhBdsGDo=; b=AcTps797O6hiw7AWoEa0JGILoMhgs3yDgdeVzS4EP7uus4Ud4ZTL2lBpnSr/a+ubeXlF9O 8UZhfsU2mDa/5ADw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 138011331E; Thu, 5 Oct 2023 00:05:40 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id GbyzOtT9HWWDDQAAMHmgww (envelope-from ); Thu, 05 Oct 2023 00:05:40 +0000 From: Gabriel Krisman Bertazi To: axboe@kernel.dk Cc: io-uring@vger.kernel.org, jmoyer@redhat.com, Gabriel Krisman Bertazi Subject: [PATCH 1/3] io_uring: Fix check of BID wrapping in provided buffers Date: Wed, 4 Oct 2023 20:05:29 -0400 Message-ID: <20231005000531.30800-2-krisman@suse.de> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231005000531.30800-1-krisman@suse.de> References: <20231005000531.30800-1-krisman@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Commit 3851d25c75ed0 ("io_uring: check for rollover of buffer ID when providing buffers") introduced a check to prevent wrapping the BID counter when sqe->off is provided, but it's off-by-one too restrictive, rejecting the last possible BID (65534). i.e., the following fails with -EINVAL. io_uring_prep_provide_buffers(sqe, addr, size, 0xFFFF, 0, 0); Fixes: 3851d25c75ed ("io_uring: check for rollover of buffer ID when providing buffers") Signed-off-by: Gabriel Krisman Bertazi --- io_uring/kbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index 556f4df25b0f..52dba81c3f50 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -352,7 +352,7 @@ int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe tmp = READ_ONCE(sqe->off); if (tmp > USHRT_MAX) return -E2BIG; - if (tmp + p->nbufs >= USHRT_MAX) + if (tmp + p->nbufs > USHRT_MAX) return -EINVAL; p->bid = tmp; return 0; -- 2.42.0