[Qemu-devel] [PATCH] cadence_gem: fix buffer overflow

["Michael S. Tsirkin" <mst@redhat.com>]

gem_receive copies a packet received from network into an rxbuf[2048]
array on stack, with size limited by descriptor length set by guest.  If
guest is malicious and specifies a descriptor length that is too large,
and should packet size exceed array size, this results in a buffer
overflow.

Reported-by: 刘令 <liuling-it@360.cn>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/net/cadence_gem.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index 3639fc1..15a0786 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -862,6 +862,14 @@ static void gem_transmit(CadenceGEMState *s)
             break;
         }
 
+        if (tx_desc_get_length(desc) > sizeof(tx_packet) - (p - tx_packet)) {
+            DB_PRINT("TX descriptor @ 0x%x too large: size 0x%x space 0x%x\n",
+                     (unsigned)packet_desc_addr,
+                     (unsigned)tx_desc_get_length(desc),
+                     sizeof(tx_packet) - (p - tx_packet));
+            break;
+        }
+
         /* Gather this fragment of the packet from "dma memory" to our contig.
          * buffer.
          */
-- 
MST