NVMe: Fix sparse warnings in scsi emulation

Sparse produced warnings for some instances of
mismatched types and direct userspace dereferences.
This patch fixes those for the scsi emulation layer.
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

drivers/block/nvme-scsi.c

@@ -380,11 +380,16 @@ static int nvme_trans_copy_to_user(struct sg_io_hdr *hdr, void *from,
 	size_t xfer_len;
 
 	if (hdr->iovec_count > 0) {
-		struct sg_iovec *sgl = hdr->dxferp;
+		struct sg_iovec sgl;
 
 		for (i = 0; i < hdr->iovec_count; i++) {
-			xfer_len = min(remaining, sgl[i].iov_len);
-			not_copied = copy_to_user(__user sgl[i].iov_base, index,
+			not_copied = copy_from_user(&sgl, hdr->dxferp +
+						i * sizeof(struct sg_iovec),
+						sizeof(struct sg_iovec));
+			if (not_copied)
+				return -EFAULT;
+			xfer_len = min(remaining, sgl.iov_len);
+			not_copied = copy_to_user(sgl.iov_base, index,
 								xfer_len);
 			if (not_copied) {
 				res = -EFAULT;
@@ -397,7 +402,7 @@ static int nvme_trans_copy_to_user(struct sg_io_hdr *hdr, void *from,
 		}
 		return res;
 	}
-	not_copied = copy_to_user(__user hdr->dxferp, from, n);
+	not_copied = copy_to_user(hdr->dxferp, from, n);
 	if (not_copied)
 		res = -EFAULT;
 	return res;
@@ -416,12 +421,17 @@ static int nvme_trans_copy_from_user(struct sg_io_hdr *hdr, void *to,
 	size_t xfer_len;
 
 	if (hdr->iovec_count > 0) {
-		struct sg_iovec *sgl = hdr->dxferp;
+		struct sg_iovec sgl;
 
 		for (i = 0; i < hdr->iovec_count; i++) {
-			xfer_len = min(remaining, sgl[i].iov_len);
-			not_copied = copy_from_user(index,
-					__user sgl[i].iov_base, xfer_len);
+			not_copied = copy_from_user(&sgl, hdr->dxferp +
+						i * sizeof(struct sg_iovec),
+						sizeof(struct sg_iovec));
+			if (not_copied)
+				return -EFAULT;
+			xfer_len = min(remaining, sgl.iov_len);
+			not_copied = copy_from_user(index, sgl.iov_base,
+								xfer_len);
 			if (not_copied) {
 				res = -EFAULT;
 				break;
@@ -434,7 +444,7 @@ static int nvme_trans_copy_from_user(struct sg_io_hdr *hdr, void *to,
 		return res;
 	}
 
-	not_copied = copy_from_user(to, __user hdr->dxferp, n);
+	not_copied = copy_from_user(to, hdr->dxferp, n);
 	if (not_copied)
 		res = -EFAULT;
 	return res;
@@ -469,7 +479,7 @@ static int nvme_trans_completion(struct sg_io_hdr *hdr, u8 status, u8 sense_key,
 
 		xfer_len = min_t(u8, hdr->mx_sb_len, DESC_FMT_SENSE_DATA_SIZE);
 		hdr->sb_len_wr = xfer_len;
-		if (copy_to_user(__user hdr->sbp, resp, xfer_len) > 0)
+		if (copy_to_user(hdr->sbp, resp, xfer_len) > 0)
 			res = -EFAULT;
 	}
 
@@ -774,7 +784,7 @@ static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	int nvme_sc;
 	u8 ieee[4];
 	int xfer_len;
-	u32 tmp_id = cpu_to_be64(ns->ns_id);
+	__be32 tmp_id = cpu_to_be32(ns->ns_id);
 
 	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
 					&dma_addr, GFP_KERNEL);
@@ -1190,15 +1200,15 @@ static int nvme_trans_fill_blk_desc(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	lba_length = (1 << (id_ns->lbaf[flbas].ds));
 
 	if (llbaa == 0) {
-		u32 tmp_cap = cpu_to_be32(id_ns->ncap);
+		__be32 tmp_cap = cpu_to_be32(le64_to_cpu(id_ns->ncap));
 		/* Byte 4 is reserved */
-		u32 tmp_len = cpu_to_be32(lba_length) & 0x00FFFFFF;
+		__be32 tmp_len = cpu_to_be32(lba_length & 0x00FFFFFF);
 
 		memcpy(resp, &tmp_cap, sizeof(u32));
 		memcpy(&resp[4], &tmp_len, sizeof(u32));
 	} else {
-		u64 tmp_cap = cpu_to_be64(id_ns->ncap);
-		u32 tmp_len = cpu_to_be32(lba_length);
+		__be64 tmp_cap = cpu_to_be64(le64_to_cpu(id_ns->ncap));
+		__be32 tmp_len = cpu_to_be32(lba_length);
 
 		memcpy(resp, &tmp_cap, sizeof(u64));
 		/* Bytes 8, 9, 10, 11 are reserved */
@@ -1412,9 +1422,9 @@ static void nvme_trans_fill_read_cap(u8 *response, struct nvme_id_ns *id_ns,
 	u64 rlba;
 	u8 prot_en;
 	u8 p_type_lut[4] = {0, 0, 1, 2};
-	u64 tmp_rlba;
-	u32 tmp_rlba_32;
-	u32 tmp_len;
+	__be64 tmp_rlba;
+	__be32 tmp_rlba_32;
+	__be32 tmp_len;
 
 	flbas = (id_ns->flbas) & 0x0F;
 	lba_length = (1 << (id_ns->lbaf[flbas].ds));
@@ -1563,12 +1573,13 @@ static int nvme_trans_send_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 			goto out_unmap;
 		}
 
-		c.dlfw.numd = (tot_len/BYTES_TO_DWORDS) - 1;
-		c.dlfw.offset = offset/BYTES_TO_DWORDS;
+		c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
+		c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
 	} else if (opcode == nvme_admin_activate_fw) {
-		c.common.cdw10[0] = buffer_id;
+		c.common.cdw10[0] = cpu_to_le32(buffer_id);
 		/* AA=01b Replace & activate at reset */
-		c.common.cdw10[0] |= 0x00000008;
+		c.common.cdw10[0] = cpu_to_le32(le32_to_cpu(
+						c.common.cdw10[0]) | 0x00000008);
 	}
 
 	nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
@@ -1800,7 +1811,7 @@ static int nvme_trans_fmt_set_blk_size_count(struct nvme_ns *ns,
 		id_ns = mem;
 
 		if (ns->mode_select_num_blocks == 0)
-			ns->mode_select_num_blocks = id_ns->ncap;
+			ns->mode_select_num_blocks = le64_to_cpu(id_ns->ncap);
 		if (ns->mode_select_block_len == 0) {
 			flbas = (id_ns->flbas) & 0x0F;
 			ns->mode_select_block_len =
@@ -1920,7 +1931,7 @@ static int nvme_trans_fmt_send_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 				ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
 				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
 	}
-	if (ns->mode_select_num_blocks != id_ns->ncap) {
+	if (ns->mode_select_num_blocks != le64_to_cpu(id_ns->ncap)) {
 		res = nvme_trans_completion(hdr, SAM_STAT_CHECK_CONDITION,
 				ILLEGAL_REQUEST, SCSI_ASC_INVALID_PARAMETER,
 				SCSI_ASCQ_CAUSE_NOT_REPORTABLE);
@@ -1930,7 +1941,7 @@ static int nvme_trans_fmt_send_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	cdw10 |= selected_lbaf & 0x0F;
 	memset(&c, 0, sizeof(c));
 	c.format.opcode = nvme_admin_format_nvm;
-	c.format.nsid = ns->ns_id;
+	c.format.nsid = cpu_to_le32(ns->ns_id);
 	c.format.cdw10 = cpu_to_le32(cdw10);
 
 	nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);
@@ -2036,7 +2047,7 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	u32 retcode;
 	u32 i = 0;
 	u64 nvme_offset = 0;
-	void *next_mapping_addr;
+	void __user *next_mapping_addr;
 	struct nvme_command c;
 	u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
 	u16 control;
@@ -2056,11 +2067,16 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	for (i = 0; i < num_cmds; i++) {
 		memset(&c, 0, sizeof(c));
 		if (hdr->iovec_count > 0) {
-			struct sg_iovec *sgl = hdr->dxferp;
+			struct sg_iovec sgl;
 
-			unit_len = sgl[i].iov_len;
+			retcode = copy_from_user(&sgl, hdr->dxferp +
+					i * sizeof(struct sg_iovec),
+					sizeof(struct sg_iovec));
+			if (retcode)
+				return -EFAULT;
+			unit_len = sgl.iov_len;
 			unit_num_blocks = unit_len >> ns->lba_shift;
-			next_mapping_addr = sgl[i].iov_base;
+			next_mapping_addr = sgl.iov_base;
 		} else {
 			unit_num_blocks = min((u64)max_blocks,
 					(cdb_info->xfer_len - nvme_offset));
@@ -2138,8 +2154,9 @@ static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
 	u8 opcode = cmd[0];
 	u64 xfer_bytes;
 	u64 sum_iov_len = 0;
-	struct sg_iovec *sgl;
+	struct sg_iovec sgl;
 	int i;
+	size_t not_copied;
 
 	/* Extract Fields from CDB */
 	switch (opcode) {
@@ -2167,11 +2184,15 @@ static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
 
 	/* Calculate total length of transfer (in bytes) */
 	if (hdr->iovec_count > 0) {
-		sgl = hdr->dxferp;
 		for (i = 0; i < hdr->iovec_count; i++) {
-			sum_iov_len += sgl[i].iov_len;
+			not_copied = copy_from_user(&sgl, hdr->dxferp +
+						i * sizeof(struct sg_iovec),
+						sizeof(struct sg_iovec));
+			if (not_copied)
+				return -EFAULT;
+			sum_iov_len += sgl.iov_len;
 			/* IO vector sizes should be multiples of block size */
-			if (sgl[i].iov_len % (1 << ns->lba_shift) != 0) {
+			if (sgl.iov_len % (1 << ns->lba_shift) != 0) {
 				res = nvme_trans_completion(hdr,
 						SAM_STAT_CHECK_CONDITION,
 						ILLEGAL_REQUEST,
@@ -2494,7 +2515,7 @@ static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	struct nvme_id_ctrl *id_ctrl;
 	u32 ll_length, lun_id;
 	u8 lun_id_offset = REPORT_LUNS_FIRST_LUN_OFFSET;
-	u32 tmp_len;
+	__be32 tmp_len;
 
 	alloc_len = GET_REPORT_LUNS_ALLOC_LENGTH(cmd);
 	select_report = GET_U8_FROM_CDB(cmd, REPORT_LUNS_SR_OFFSET);
@@ -2524,7 +2545,7 @@ static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 			goto out_dma;
 		}
 		id_ctrl = mem;
-		ll_length = id_ctrl->nn * LUN_ENTRY_SIZE;
+		ll_length = le32_to_cpu(id_ctrl->nn) * LUN_ENTRY_SIZE;
 		resp_size = ll_length + LUN_DATA_HEADER_SIZE;
 
 		if (alloc_len < resp_size) {
@@ -2543,12 +2564,12 @@ static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 		memset(response, 0, resp_size);
 
 		/* The first LUN ID will always be 0 per the SAM spec */
-		for (lun_id = 0; lun_id < id_ctrl->nn; lun_id++) {
+		for (lun_id = 0; lun_id < le32_to_cpu(id_ctrl->nn); lun_id++) {
 			/*
 			 * Set the LUN Id and then increment to the next LUN
 			 * location in the parameter data.
 			 */
-			u64 tmp_id = cpu_to_be64(lun_id);
+			__be64 tmp_id = cpu_to_be64(lun_id);
 			memcpy(&response[lun_id_offset], &tmp_id, sizeof(u64));
 			lun_id_offset += LUN_ENTRY_SIZE;
 		}
@@ -2929,7 +2950,7 @@ int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr)
 		return retcode;
 	if (retcode > 0)
 		retcode = SNTI_TRANSLATION_SUCCESS;
-	if (copy_to_user(__user u_hdr, &hdr, sizeof(sg_io_hdr_t)) > 0)
+	if (copy_to_user(u_hdr, &hdr, sizeof(sg_io_hdr_t)) > 0)
 		return -EFAULT;
 
 	return retcode;