net: Real fix for check_params users

OK, last try: 8e4416af45 broke -net socket, ffad4116b9 tried to fix it
but broke error reporting of invalid parameters. So this patch widely
reverts ffad4116b9 again and intead fixes those callers of check_params
that originally suffered from overwritten buffers by using separate
ones.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>

1 files changed, 12 insertions, 11 deletions

diff --git a/net.c b/net.c
index 390d6a66e5..723e934224 100644
--- a/net.c
+++ b/net.c
@@ -1911,7 +1911,7 @@ int net_client_init(const char *device, const char *p)
         uint8_t *macaddr;
         int idx = nic_get_free_idx();
 
-        if (check_params(nic_params, p) < 0) {
+        if (check_params(buf, sizeof(buf), nic_params, p) < 0) {
             fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                     buf, p);
             return -1;
@@ -1962,7 +1962,7 @@ int net_client_init(const char *device, const char *p)
         static const char * const slirp_params[] = {
             "vlan", "name", "hostname", "restrict", "ip", NULL
         };
-        if (check_params(slirp_params, p) < 0) {
+        if (check_params(buf, sizeof(buf), slirp_params, p) < 0) {
             fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                     buf, p);
             return -1;
@@ -2013,7 +2013,7 @@ int net_client_init(const char *device, const char *p)
         };
         char ifname[64];
 
-        if (check_params(tap_params, p) < 0) {
+        if (check_params(buf, sizeof(buf), tap_params, p) < 0) {
             fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                     buf, p);
             return -1;
@@ -2029,12 +2029,12 @@ int net_client_init(const char *device, const char *p)
 #elif defined (_AIX)
 #else
     if (!strcmp(device, "tap")) {
-        char ifname[64];
+        char ifname[64], chkbuf[64];
         char setup_script[1024], down_script[1024];
         int fd;
         vlan->nb_host_devs++;
         if (get_param_value(buf, sizeof(buf), "fd", p) > 0) {
-            if (check_params(fd_params, p) < 0) {
+            if (check_params(chkbuf, sizeof(chkbuf), fd_params, p) < 0) {
                 fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                         buf, p);
                 return -1;
@@ -2047,7 +2047,7 @@ int net_client_init(const char *device, const char *p)
             static const char * const tap_params[] = {
                 "vlan", "name", "ifname", "script", "downscript", NULL
             };
-            if (check_params(tap_params, p) < 0) {
+            if (check_params(chkbuf, sizeof(chkbuf), tap_params, p) < 0) {
                 fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                         buf, p);
                 return -1;
@@ -2066,9 +2066,10 @@ int net_client_init(const char *device, const char *p)
     } else
 #endif
     if (!strcmp(device, "socket")) {
+        char chkbuf[64];
         if (get_param_value(buf, sizeof(buf), "fd", p) > 0) {
             int fd;
-            if (check_params(fd_params, p) < 0) {
+            if (check_params(chkbuf, sizeof(chkbuf), fd_params, p) < 0) {
                 fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                         buf, p);
                 return -1;
@@ -2081,7 +2082,7 @@ int net_client_init(const char *device, const char *p)
             static const char * const listen_params[] = {
                 "vlan", "name", "listen", NULL
             };
-            if (check_params(listen_params, p) < 0) {
+            if (check_params(chkbuf, sizeof(chkbuf), listen_params, p) < 0) {
                 fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                         buf, p);
                 return -1;
@@ -2091,7 +2092,7 @@ int net_client_init(const char *device, const char *p)
             static const char * const connect_params[] = {
                 "vlan", "name", "connect", NULL
             };
-            if (check_params(connect_params, p) < 0) {
+            if (check_params(chkbuf, sizeof(chkbuf), connect_params, p) < 0) {
                 fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                         buf, p);
                 return -1;
@@ -2101,7 +2102,7 @@ int net_client_init(const char *device, const char *p)
             static const char * const mcast_params[] = {
                 "vlan", "name", "mcast", NULL
             };
-            if (check_params(mcast_params, p) < 0) {
+            if (check_params(chkbuf, sizeof(chkbuf), mcast_params, p) < 0) {
                 fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                         buf, p);
                 return -1;
@@ -2122,7 +2123,7 @@ int net_client_init(const char *device, const char *p)
         char vde_sock[1024], vde_group[512];
 	int vde_port, vde_mode;
 
-        if (check_params(vde_params, p) < 0) {
+        if (check_params(buf, sizeof(buf), vde_params, p) < 0) {
             fprintf(stderr, "qemu: invalid parameter '%s' in '%s'\n",
                     buf, p);
             return -1;