rdma/res-ctx.c - main - githubmirror/iproute2

rdma/res-ctx.c
103 строки3 KB
wenglianfa
rdma: Fix the error of accessing string variable outside the lifecycle
08 янв 2024, 19:45
08 янв 2024, 19:453a882b6
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * res-ctx.c	RDMA tool
 * Authors:     Neta Ostrovsky <netao@nvidia.com>
 */

#include "res.h"
#include <inttypes.h>

static int res_ctx_line(struct rd *rd, const char *name, int idx,
			struct nlattr **nla_line)
{
	char *comm = NULL;
	uint32_t ctxn = 0;
	uint32_t pid = 0;
	SPRINT_BUF(b);

	if (!nla_line[RDMA_NLDEV_ATTR_RES_CTXN])
		return MNL_CB_ERROR;

	if (nla_line[RDMA_NLDEV_ATTR_RES_PID]) {
		pid = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_PID]);
		if (!get_task_name(pid, b, sizeof(b)))
			comm = b;
	} else if (nla_line[RDMA_NLDEV_ATTR_RES_KERN_NAME]) {
		/* discard const from mnl_attr_get_str */
		comm = (char *)mnl_attr_get_str(
			nla_line[RDMA_NLDEV_ATTR_RES_KERN_NAME]);
	}

	if (rd_is_filtered_attr(rd, "pid", pid,
				nla_line[RDMA_NLDEV_ATTR_RES_PID]))
		goto out;

	if (nla_line[RDMA_NLDEV_ATTR_RES_CTXN])
		ctxn = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_CTXN]);

	if (rd_is_filtered_attr(rd, "ctxn", ctxn,
				nla_line[RDMA_NLDEV_ATTR_RES_CTXN]))
		goto out;

	open_json_object(NULL);
	print_dev(idx, name);
	res_print_u32("ctxn", ctxn, nla_line[RDMA_NLDEV_ATTR_RES_CTXN]);
	res_print_u32("pid", pid, nla_line[RDMA_NLDEV_ATTR_RES_PID]);
	print_comm(comm, nla_line);

	print_driver_table(rd, nla_line[RDMA_NLDEV_ATTR_DRIVER]);
	close_json_object();
	newline();

out:
	return MNL_CB_OK;
}

int res_ctx_idx_parse_cb(const struct nlmsghdr *nlh, void *data)
{
	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
	struct rd *rd = data;
	const char *name;
	uint32_t idx;

	mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
	if (!tb[RDMA_NLDEV_ATTR_DEV_INDEX] || !tb[RDMA_NLDEV_ATTR_DEV_NAME])
		return MNL_CB_ERROR;

	name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]);
	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);

	return res_ctx_line(rd, name, idx, tb);
}

int res_ctx_parse_cb(const struct nlmsghdr *nlh, void *data)
{
	struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
	struct nlattr *nla_table, *nla_entry;
	struct rd *rd = data;
	int ret = MNL_CB_OK;
	const char *name;
	uint32_t idx;

	mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
	if (!tb[RDMA_NLDEV_ATTR_DEV_INDEX] || !tb[RDMA_NLDEV_ATTR_DEV_NAME] ||
	    !tb[RDMA_NLDEV_ATTR_RES_CTX])
		return MNL_CB_ERROR;

	name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]);
	idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
	nla_table = tb[RDMA_NLDEV_ATTR_RES_CTX];

	mnl_attr_for_each_nested(nla_entry, nla_table) {
		struct nlattr *nla_line[RDMA_NLDEV_ATTR_MAX] = {};

		ret = mnl_attr_parse_nested(nla_entry, rd_attr_cb, nla_line);
		if (ret != MNL_CB_OK)
			break;

		ret = res_ctx_line(rd, name, idx, nla_line);
		if (ret != MNL_CB_OK)
			break;
	}
	return ret;
}