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 CB7AC37475B for ; Wed, 28 Jan 2026 20:32:55 +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=1769632375; cv=none; b=N1ONvg1Y94qJ+AukBNLd5htubvPq9mh8yA0e6jR4XS9xxQYWDIIysHY8svURE1J0Cc8fkSTgD+CKopWudSkEPQCYSlgrgwU8R8eCo0HmvIl3sk3FnUl9oPhJd2x41tUP+n86HiL0bK/s6KZOKfF9OX2MYBgJGmcWSsNGBMM1TrU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769632375; c=relaxed/simple; bh=7F60oaeT5MzFIlwL9flGFjJY6KT6LoBjbvdNzvpG3UQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=b7qw+9m1hArPY4N3bJZZHUBxykg3OlJoIyFWvd3tVveHWHgVW45UGHoAdp/ugCZOMxgWD5PMwc8MNyg5c73S/b+nRJTR8q+8nNKwF5NIthVnT5XVbEUbBcr1LiT5tgN1G4CAU3OgGB1XmURDjR3zNPw0wftObZXQIuy9L6PMXYY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cNoX00SJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cNoX00SJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DD6EC4CEF1; Wed, 28 Jan 2026 20:32:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769632375; bh=7F60oaeT5MzFIlwL9flGFjJY6KT6LoBjbvdNzvpG3UQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cNoX00SJOBaKCRmdVPdn23RK7V1gBX3D4hLKaUhVq0u4os9cogoStoIgAqZMWxEiK KpORG4Dfb5KPiy/AN0eTQXIIuaUBKEFeL3JmfIbWqhxbcG6yfMtH4DD4LTi3b4BIE1 dUCj8XqeEH9uy1dWVm84ClfH7HL4V1diXkTxPJVjahZBriKDV94UPZ5vnhCtV8jwPK aJuBPPVd4m9Lm6kuioM/pwTYF1JLdinH3HyADM9YFNT+ULXTIkvIFiQFtgvEMYLeA1 fYRvyIS0IBGeQWBHk0M8a4WFzoq/pJgcY2iZyPxXb7AvCstfs0dVzl2u/oGpsSPZOz ZxV2f6JcirRrQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Thomas Fourier , Namjae Jeon , Steve French , Sasha Levin Subject: [PATCH 6.12.y] ksmbd: smbd: fix dma_unmap_sg() nents Date: Wed, 28 Jan 2026 15:32:52 -0500 Message-ID: <20260128203252.2719545-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <2026012756-tribesman-blasphemy-c0e6@gregkh> References: <2026012756-tribesman-blasphemy-c0e6@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Thomas Fourier [ Upstream commit 98e3e2b561bc88f4dd218d1c05890672874692f6 ] The dma_unmap_sg() functions should be called with the same nents as the dma_map_sg(), not the value the map function returned. Fixes: 0626e6641f6b ("cifsd: add server handler for central processing and tranport layers") Cc: Signed-off-by: Thomas Fourier Acked-by: Namjae Jeon Signed-off-by: Steve French [ Context ] Signed-off-by: Sasha Levin --- fs/smb/server/transport_rdma.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/fs/smb/server/transport_rdma.c b/fs/smb/server/transport_rdma.c index bf79c066a982e..d15c33480e0a9 100644 --- a/fs/smb/server/transport_rdma.c +++ b/fs/smb/server/transport_rdma.c @@ -1108,14 +1108,12 @@ static int get_sg_list(void *buf, int size, struct scatterlist *sg_list, int nen static int get_mapped_sg_list(struct ib_device *device, void *buf, int size, struct scatterlist *sg_list, int nentries, - enum dma_data_direction dir) + enum dma_data_direction dir, int *npages) { - int npages; - - npages = get_sg_list(buf, size, sg_list, nentries); - if (npages < 0) + *npages = get_sg_list(buf, size, sg_list, nentries); + if (*npages < 0) return -EINVAL; - return ib_dma_map_sg(device, sg_list, npages, dir); + return ib_dma_map_sg(device, sg_list, *npages, dir); } static int post_sendmsg(struct smb_direct_transport *t, @@ -1184,12 +1182,13 @@ static int smb_direct_post_send_data(struct smb_direct_transport *t, for (i = 0; i < niov; i++) { struct ib_sge *sge; int sg_cnt; + int npages; sg_init_table(sg, SMB_DIRECT_MAX_SEND_SGES - 1); sg_cnt = get_mapped_sg_list(t->cm_id->device, iov[i].iov_base, iov[i].iov_len, sg, SMB_DIRECT_MAX_SEND_SGES - 1, - DMA_TO_DEVICE); + DMA_TO_DEVICE, &npages); if (sg_cnt <= 0) { pr_err("failed to map buffer\n"); ret = -ENOMEM; @@ -1197,7 +1196,7 @@ static int smb_direct_post_send_data(struct smb_direct_transport *t, } else if (sg_cnt + msg->num_sge > SMB_DIRECT_MAX_SEND_SGES) { pr_err("buffer not fitted into sges\n"); ret = -E2BIG; - ib_dma_unmap_sg(t->cm_id->device, sg, sg_cnt, + ib_dma_unmap_sg(t->cm_id->device, sg, npages, DMA_TO_DEVICE); goto err; } -- 2.51.0