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Date: Tue, 1 Feb 2022 18:39:25 +0100
From: Andrea Claudi <aclaudi@...hat.com>
To: netdev@...r.kernel.org
Cc: stephen@...workplumber.org, dsahern@...il.com,
markzhang@...dia.com, leonro@...dia.com
Subject: [PATCH iproute2 2/3] rdma: stat: fix memory leak in res_counter_line()
get_task_name() uses asprintf() to reserve storage for the task name
string. As asprintf() manpage states, a free() should be used to release
the allocated storage when it is no longer needed.
res_counter_line() uses get_task_name() but does not free the allocated
storage on the error paths and after the usage.
This uses a single return point to free the allocated storage, adopting
the same approach of other rdma code using get_task_name().
Fixes: 5937552b42e4 ("rdma: Add "stat qp show" support")
Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
---
rdma/stat.c | 74 ++++++++++++++++++++++++++++++++++++-----------------
1 file changed, 50 insertions(+), 24 deletions(-)
diff --git a/rdma/stat.c b/rdma/stat.c
index adfcd34a..66121b12 100644
--- a/rdma/stat.c
+++ b/rdma/stat.c
@@ -222,9 +222,9 @@ static int res_counter_line(struct rd *rd, const char *name, int index,
uint32_t cntn, port = 0, pid = 0, qpn, qp_type = 0;
struct nlattr *hwc_table, *qp_table;
struct nlattr *nla_entry;
- const char *comm = NULL;
+ char *comm = NULL;
bool isfirst;
- int err;
+ int err, ret;
if (nla_line[RDMA_NLDEV_ATTR_PORT_INDEX])
port = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_PORT_INDEX]);
@@ -232,52 +232,70 @@ static int res_counter_line(struct rd *rd, const char *name, int index,
hwc_table = nla_line[RDMA_NLDEV_ATTR_STAT_HWCOUNTERS];
qp_table = nla_line[RDMA_NLDEV_ATTR_RES_QP];
if (!hwc_table || !qp_table ||
- !nla_line[RDMA_NLDEV_ATTR_STAT_COUNTER_ID])
- return MNL_CB_ERROR;
+ !nla_line[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]) {
+ ret = MNL_CB_ERROR;
+ goto out;
+ }
cntn = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]);
if (rd_is_filtered_attr(rd, "cntn", cntn,
- nla_line[RDMA_NLDEV_ATTR_STAT_COUNTER_ID]))
- return MNL_CB_OK;
+ nla_line[RDMA_NLDEV_ATTR_STAT_COUNTER_ID])) {
+ ret = MNL_CB_OK;
+ goto out;
+ }
if (nla_line[RDMA_NLDEV_ATTR_RES_TYPE])
qp_type = mnl_attr_get_u8(nla_line[RDMA_NLDEV_ATTR_RES_TYPE]);
if (rd_is_string_filtered_attr(rd, "qp-type", qp_types_to_str(qp_type),
- nla_line[RDMA_NLDEV_ATTR_RES_TYPE]))
- return MNL_CB_OK;
+ nla_line[RDMA_NLDEV_ATTR_RES_TYPE])) {
+ ret = MNL_CB_OK;
+ goto out;
+ }
if (nla_line[RDMA_NLDEV_ATTR_RES_PID]) {
pid = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_PID]);
comm = get_task_name(pid);
}
if (rd_is_filtered_attr(rd, "pid", pid,
- nla_line[RDMA_NLDEV_ATTR_RES_PID]))
- return MNL_CB_OK;
+ nla_line[RDMA_NLDEV_ATTR_RES_PID])) {
+ ret = MNL_CB_OK;
+ goto out;
+ }
- if (nla_line[RDMA_NLDEV_ATTR_RES_KERN_NAME])
+ 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]);
+ }
mnl_attr_for_each_nested(nla_entry, qp_table) {
struct nlattr *qp_line[RDMA_NLDEV_ATTR_MAX] = {};
err = mnl_attr_parse_nested(nla_entry, rd_attr_cb, qp_line);
- if (err != MNL_CB_OK)
- return -EINVAL;
+ if (err != MNL_CB_OK) {
+ ret = -EINVAL;
+ goto out;
+ }
- if (!qp_line[RDMA_NLDEV_ATTR_RES_LQPN])
- return -EINVAL;
+ if (!qp_line[RDMA_NLDEV_ATTR_RES_LQPN]) {
+ ret = -EINVAL;
+ goto out;
+ }
qpn = mnl_attr_get_u32(qp_line[RDMA_NLDEV_ATTR_RES_LQPN]);
if (rd_is_filtered_attr(rd, "lqpn", qpn,
- qp_line[RDMA_NLDEV_ATTR_RES_LQPN]))
- return MNL_CB_OK;
+ qp_line[RDMA_NLDEV_ATTR_RES_LQPN])) {
+ ret = MNL_CB_OK;
+ goto out;
+ }
}
err = res_get_hwcounters(rd, hwc_table, false);
- if (err != MNL_CB_OK)
- return err;
+ if (err != MNL_CB_OK) {
+ ret = err;
+ goto out;
+ }
open_json_object(NULL);
print_link(rd, index, name, port, nla_line);
print_color_uint(PRINT_ANY, COLOR_NONE, "cntn", "cntn %u ", cntn);
@@ -292,11 +310,15 @@ static int res_counter_line(struct rd *rd, const char *name, int index,
mnl_attr_for_each_nested(nla_entry, qp_table) {
struct nlattr *qp_line[RDMA_NLDEV_ATTR_MAX] = {};
err = mnl_attr_parse_nested(nla_entry, rd_attr_cb, qp_line);
- if (err != MNL_CB_OK)
- return -EINVAL;
+ if (err != MNL_CB_OK) {
+ ret = -EINVAL;
+ goto out;
+ }
- if (!qp_line[RDMA_NLDEV_ATTR_RES_LQPN])
- return -EINVAL;
+ if (!qp_line[RDMA_NLDEV_ATTR_RES_LQPN]) {
+ ret = -EINVAL;
+ goto out;
+ }
qpn = mnl_attr_get_u32(qp_line[RDMA_NLDEV_ATTR_RES_LQPN]);
if (!isfirst)
@@ -307,7 +329,11 @@ static int res_counter_line(struct rd *rd, const char *name, int index,
}
close_json_array(PRINT_ANY, ">");
newline(rd);
- return MNL_CB_OK;
+ ret = MNL_CB_OK;
+out:
+ if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
+ free(comm);
+ return ret;
}
static int stat_qp_show_parse_cb(const struct nlmsghdr *nlh, void *data)
--
2.34.1
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