diff mbox series

[97/99] tap: fix memory leak on success to create a tap device

Message ID 20180723201748.25573-98-mdroth@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show
Series Patch Round-up for stable 2.12.1, freeze on 2018-07-30 | expand

Commit Message

Michael Roth July 23, 2018, 8:17 p.m. UTC 
From: Yunjian Wang <wangyunjian@huawei.com>

The memory leak on success to create a tap device. And the nfds and
nvhosts may not be the same and need to be processed separately.

Fixes: 07825977 ("tap: fix memory leak on failure to create a multiqueue tap device")
Fixes: 264986e2 ("tap: multiqueue support")
Cc: qemu-stable@nongnu.org
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 323e7c117754e4d4ce6b4282d74ad01c99d67714)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 net/tap.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/net/tap.c b/net/tap.c
index 89c4e19162..e807e0ea2f 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -805,7 +805,8 @@  int net_init_tap(const Netdev *netdev, const char *name,
     } else if (tap->has_fds) {
         char **fds;
         char **vhost_fds;
-        int nfds, nvhosts;
+        int nfds = 0, nvhosts = 0;
+        int ret = 0;
 
         if (tap->has_ifname || tap->has_script || tap->has_downscript ||
             tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
@@ -825,6 +826,7 @@  int net_init_tap(const Netdev *netdev, const char *name,
             if (nfds != nvhosts) {
                 error_setg(errp, "The number of fds passed does not match "
                            "the number of vhostfds passed");
+                ret = -1;
                 goto free_fail;
             }
         }
@@ -833,6 +835,7 @@  int net_init_tap(const Netdev *netdev, const char *name,
             fd = monitor_fd_param(cur_mon, fds[i], &err);
             if (fd == -1) {
                 error_propagate(errp, err);
+                ret = -1;
                 goto free_fail;
             }
 
@@ -843,6 +846,7 @@  int net_init_tap(const Netdev *netdev, const char *name,
             } else if (vnet_hdr != tap_probe_vnet_hdr(fd)) {
                 error_setg(errp,
                            "vnet_hdr not consistent across given tap fds");
+                ret = -1;
                 goto free_fail;
             }
 
@@ -852,21 +856,21 @@  int net_init_tap(const Netdev *netdev, const char *name,
                              vnet_hdr, fd, &err);
             if (err) {
                 error_propagate(errp, err);
+                ret = -1;
                 goto free_fail;
             }
         }
-        g_free(fds);
-        g_free(vhost_fds);
-        return 0;
 
 free_fail:
+        for (i = 0; i < nvhosts; i++) {
+            g_free(vhost_fds[i]);
+        }
         for (i = 0; i < nfds; i++) {
             g_free(fds[i]);
-            g_free(vhost_fds[i]);
         }
         g_free(fds);
         g_free(vhost_fds);
-        return -1;
+        return ret;
     } else if (tap->has_helper) {
         if (tap->has_ifname || tap->has_script || tap->has_downscript ||
             tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {