qemu-arm
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-arm] [PATCH] hw/net: Fix a heap overflow in xlnx.xps-ethernetlite


From: chaojianhu
Subject: [Qemu-arm] [PATCH] hw/net: Fix a heap overflow in xlnx.xps-ethernetlite
Date: Tue, 9 Aug 2016 10:24:17 +0800

The .receive callback of xlnx.xps-ethernetlite doesn't check the length
of data before calling memcpy. As a result, the NetClientState object in
heap will be overflowd. All versions of qemu with xlnx.xps-ethernetlite
will be affected.

Reported-by: chaojianhu <address@hidden>

---
 hw/net/xilinx_ethlite.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index 54db2b8..6d3eecc 100644
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -197,6 +197,10 @@ static ssize_t eth_rx(NetClientState *nc, const uint8_t 
*buf, size_t size)
     }
 
     D(qemu_log("%s %zd rxbase=%x\n", __func__, size, rxbase));
+    if (size > (R_MAX - R_RX_BUF0 - rxbase) * 4 ) {
+        D(qemu_log("ethlite packet is too big, size=%x\n", size);
+        return -1;
+    }
     memcpy(&s->regs[rxbase + R_RX_BUF0], buf, size);
 
     s->regs[rxbase + R_RX_CTRL0] |= CTRL_S;
-- 
1.9.1




reply via email to

[Prev in Thread] Current Thread [Next in Thread]