vhost: fix name not null terminated

Fix issue reported by Coverity.
Coverity ID 124556

If the buffer is treated as a null terminated string in later operations,
a buffer overflow or over-read may occur.

In vhost_set_ifname: The string buffer may not have a null terminator if
the source string's length is equal to the buffer size

Fixes: 54292e9520e0 ("vhost: support ifname for vhost-user")

Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index d870ad9..f4695af 100644 (file)
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -320,6 +320,7 @@ vhost_set_ifname(struct vhost_device_ctx ctx,
                sizeof(dev->ifname) : if_len;
 
        strncpy(dev->ifname, if_name, len);
+       dev->ifname[sizeof(dev->ifname) - 1] = '\0';
 }