Tools: hv: fix send/recv buffer allocation

[~andy/linux] / tools / hv / hv_vss_daemon.c

diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
index 826d499dc3542ade376e728ab86cfe622dab60a5..4213d0e3083f3f576d8fa766a8ea97eb6ab05630 100644 (file)
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -38,8 +38,6 @@
 #include <linux/netlink.h>
 #include <syslog.h>
 
-static char vss_recv_buffer[4096];
-static char vss_send_buffer[4096];
 static struct sockaddr_nl addr;
 
 #ifndef SOL_NETLINK
@@ -147,6 +145,9 @@ int main(void)
        struct cn_msg   *incoming_cn_msg;
        int     op;
        struct hv_vss_msg *vss_msg;
+       char *vss_send_buffer;
+       char *vss_recv_buffer;
+       size_t vss_recv_buffer_len;
 
        if (daemon(1, 0))
                return 1;
@@ -154,6 +155,14 @@ int main(void)
        openlog("Hyper-V VSS", 0, LOG_USER);
        syslog(LOG_INFO, "VSS starting; pid is:%d", getpid());
 
+       vss_recv_buffer_len = NLMSG_HDRLEN + sizeof(struct cn_msg) + sizeof(struct hv_vss_msg);
+       vss_send_buffer = calloc(1, vss_recv_buffer_len);
+       vss_recv_buffer = calloc(1, vss_recv_buffer_len);
+       if (!(vss_send_buffer && vss_recv_buffer)) {
+               syslog(LOG_ERR, "Failed to allocate netlink buffers");
+               exit(EXIT_FAILURE);
+       }
+
        fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
        if (fd < 0) {
                syslog(LOG_ERR, "netlink socket creation failed; error:%d %s",
@@ -215,7 +224,7 @@ int main(void)
                                continue;
                }
 
-               len = recvfrom(fd, vss_recv_buffer, sizeof(vss_recv_buffer), 0,
+               len = recvfrom(fd, vss_recv_buffer, vss_recv_buffer_len, 0,
                                addr_p, &addr_l);
 
                if (len < 0) {