The buffer size to receive netlink reply messages is relatively
large (32K), and it is allocated on the stack and it might
break in application is using smaller per-thread stacks.
This patch allocates temporary buffer from heap.
Fixes: ccdcba53a3f4 ("net/mlx5: use Netlink to add/remove MAC addresses")
Cc: [email protected]
Cc: [email protected]
Reported-by: Stephen Hemminger <[email protected]>
Signed-off-by: Viacheslav Ovsiienko <[email protected]>
---
v2: allocation from heap, instead of reducing buffer size
v1: http://patches.dpdk.org/patch/69158/
---
drivers/common/mlx5/mlx5_nl.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/common/mlx5/mlx5_nl.c b/drivers/common/mlx5/mlx5_nl.c
index 65efcd3..1a1033a 100644
--- a/drivers/common/mlx5/mlx5_nl.c
+++ b/drivers/common/mlx5/mlx5_nl.c
@@ -330,10 +330,10 @@ struct mlx5_nl_ifindex_data {
void *arg)
{
struct sockaddr_nl sa;
- char buf[MLX5_RECV_BUF_SIZE];
+ void *buf = malloc(MLX5_RECV_BUF_SIZE);
struct iovec iov = {
.iov_base = buf,
- .iov_len = sizeof(buf),
+ .iov_len = MLX5_RECV_BUF_SIZE,
};
struct msghdr msg = {
.msg_name = &sa,
@@ -345,6 +345,10 @@ struct mlx5_nl_ifindex_data {
int multipart = 0;
int ret = 0;
+ if (!buf) {
+ rte_errno = ENOMEM;
+ return -rte_errno;
+ }
do {
struct nlmsghdr *nh;
int recv_bytes = 0;
@@ -353,7 +357,8 @@ struct mlx5_nl_ifindex_data {
recv_bytes = recvmsg(nlsk_fd, &msg, 0);
if (recv_bytes == -1) {
rte_errno = errno;
- return -rte_errno;
+ ret = -rte_errno;
+ goto exit;
}
nh = (struct nlmsghdr *)buf;
} while (nh->nlmsg_seq != sn);
@@ -365,24 +370,30 @@ struct mlx5_nl_ifindex_data {
if (err_data->error < 0) {
rte_errno = -err_data->error;
- return -rte_errno;
+ ret = -rte_errno;
+ goto exit;
}
/* Ack message. */
- return 0;
+ ret = 0;
+ goto exit;
}
/* Multi-part msgs and their trailing DONE message. */
if (nh->nlmsg_flags & NLM_F_MULTI) {
- if (nh->nlmsg_type == NLMSG_DONE)
- return 0;
+ if (nh->nlmsg_type == NLMSG_DONE) {
+ ret = 0;
+ goto exit;
+ }
multipart = 1;
}
if (cb) {
ret = cb(nh, arg);
if (ret < 0)
- return ret;
+ goto exit;
}
}
} while (multipart);
+exit:
+ free(buf);
return ret;
}
--
1.8.3.1
