net: vmxnet: use g_new for pkt initialisation

When vmxnet transport abstraction layer initialises pkt,
the maximum fragmentation count is not checked. This could lead
to an integer overflow causing a NULL pointer dereference.
Replace g_malloc() with g_new() to catch the multiplication
overflow.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Acked-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/hw/net/vmxnet_tx_pkt.c b/hw/net/vmxnet_tx_pkt.c
index 5ba2f5ea6c75f94500cb50dc62bf1406b5ac060f..849826b15e2433d2a47f252dbdc7ed6bf6b49b4f 100644 (file)
--- a/hw/net/vmxnet_tx_pkt.c
+++ b/hw/net/vmxnet_tx_pkt.c
@@ -60,10 +60,9 @@ void vmxnet_tx_pkt_init(struct VmxnetTxPkt **pkt, uint32_t max_frags,
 {
     struct VmxnetTxPkt *p = g_malloc0(sizeof *p);
 
-    p->vec = g_malloc((sizeof *p->vec) *
-        (max_frags + VMXNET_TX_PKT_PL_START_FRAG));
+    p->vec = g_new(struct iovec, max_frags + VMXNET_TX_PKT_PL_START_FRAG);
 
-    p->raw = g_malloc((sizeof *p->raw) * max_frags);
+    p->raw = g_new(struct iovec, max_frags);
 
     p->max_payload_frags = max_frags;
     p->max_raw_frags = max_frags;