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authorPeter Lieven <pl@kamp.de>2016-06-30 11:49:40 +0200
committerJason Wang <jasowang@redhat.com>2016-09-27 17:54:22 +0800
commit47f9f15831faa549504ab9b035aaea44a02e5f95 (patch)
tree3beb277c083f7b88b669082268974e7e5afe6fc9
parent584613eacb3840c1803e665ed7edd4ac186deced (diff)
net: limit allocation in nc_sendv_compat
we only need to allocate enough memory to hold the packet. This might be less than NET_BUFSIZE. Additionally fail early if the packet is larger than NET_BUFSIZE. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
-rw-r--r--net/net.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/net.c b/net/net.c
index 0bec096d75..ec984bf782 100644
--- a/net/net.c
+++ b/net/net.c
@@ -690,9 +690,13 @@ static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
buffer = iov[0].iov_base;
offset = iov[0].iov_len;
} else {
- buf = g_new(uint8_t, NET_BUFSIZE);
+ offset = iov_size(iov, iovcnt);
+ if (offset > NET_BUFSIZE) {
+ return -1;
+ }
+ buf = g_malloc(offset);
buffer = buf;
- offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE);
+ offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
}
if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {