From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 20F202D2391; Tue, 12 Aug 2025 19:25:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755026724; cv=none; b=s9Zcdws+HIemXEm6SgtjgMCYesnIMwpD6S9v2dctBYmcS9i0zWTlShL8zyUFkpaR9jsd4tWKrN/d5nIxd0bPyJWgMYulGktMc/uYxBaIJMWA4dz1zurQN+0Z/IScFlTNNV3HosUn/5A8JGmeZrZ5veqmHJOpzOdinDcKZMp6PlE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755026724; c=relaxed/simple; bh=P8z/d3CBVsCyWxZIWDaZ4JOikMnSDY1vSYjV13EV0mo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TdiUqatJoggMqanrRA18KO3tz13R0VCwS+AS28iMdHuZRYrqlDSgLnVYgdMKVOan2avXkcokab4+MsSe3uI3o34rYfeUxmasXZlGMUlCVRadv5aA25qPhsoKeA+OSzmcgr5j5Eat/+BovgYXIOLlKsw/MkHP2nAMRGr2PwsBq8E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UJ97EvLj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UJ97EvLj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24704C4CEF0; Tue, 12 Aug 2025 19:25:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755026723; bh=P8z/d3CBVsCyWxZIWDaZ4JOikMnSDY1vSYjV13EV0mo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UJ97EvLjmaGFEyTWREX2l/HHmNhcg88gTqiMwpevUhtZ4oO+z8dWn31wB3rIzyAPu aLKnYu804cyTKQWD5gvlj6j8lRmcPG8kF3pc9z+HpLSTz50VCP9wGj2If1Spnu4dMu ctwyhk46mRPQ4tbBJT9MzAikNQ9gpSnt4nwWXREI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Namjae Jeon , Steve French , Tom Talpey , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, Stefan Metzmacher , Steve French , Sasha Levin Subject: [PATCH 6.15 421/480] smb: server: make sure we call ib_dma_unmap_single() only if we called ib_dma_map_single already Date: Tue, 12 Aug 2025 19:50:29 +0200 Message-ID: <20250812174414.778743861@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812174357.281828096@linuxfoundation.org> References: <20250812174357.281828096@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Metzmacher [ Upstream commit afb4108c92898350e66b9a009692230bcdd2ac73 ] In case of failures either ib_dma_map_single() might not be called yet or ib_dma_unmap_single() was already called. We should make sure put_recvmsg() only calls ib_dma_unmap_single() if needed. Cc: Namjae Jeon Cc: Steve French Cc: Tom Talpey Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Fixes: 0626e6641f6b ("cifsd: add server handler for central processing and tranport layers") Signed-off-by: Stefan Metzmacher Acked-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/smb/server/transport_rdma.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/fs/smb/server/transport_rdma.c b/fs/smb/server/transport_rdma.c index 393254109fc4..fac82e60ff80 100644 --- a/fs/smb/server/transport_rdma.c +++ b/fs/smb/server/transport_rdma.c @@ -265,8 +265,13 @@ smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t) static void put_recvmsg(struct smb_direct_transport *t, struct smb_direct_recvmsg *recvmsg) { - ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, - recvmsg->sge.length, DMA_FROM_DEVICE); + if (likely(recvmsg->sge.length != 0)) { + ib_dma_unmap_single(t->cm_id->device, + recvmsg->sge.addr, + recvmsg->sge.length, + DMA_FROM_DEVICE); + recvmsg->sge.length = 0; + } spin_lock(&t->recvmsg_queue_lock); list_add(&recvmsg->list, &t->recvmsg_queue); @@ -638,6 +643,7 @@ static int smb_direct_post_recv(struct smb_direct_transport *t, ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, recvmsg->sge.length, DMA_FROM_DEVICE); + recvmsg->sge.length = 0; smb_direct_disconnect_rdma_connection(t); return ret; } @@ -1819,6 +1825,7 @@ static int smb_direct_create_pools(struct smb_direct_transport *t) if (!recvmsg) goto err; recvmsg->transport = t; + recvmsg->sge.length = 0; list_add(&recvmsg->list, &t->recvmsg_queue); } t->count_avail_recvmsg = t->recv_credit_max; -- 2.39.5