skge: potential memory corruption in skge_get_regs()

The "p" buffer is 0x4000 bytes long.  B3_RI_WTO_R1 is 0x190.  The value
of "regs->len" is in the 1-0x4000 range.  The bug here is that
"regs->len - B3_RI_WTO_R1" can be a negative value which would lead to
memory corruption and an abrupt crash.

Fixes: c3f8be961808 ("[PATCH] skge: expand ethtool debug register dump")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/skge.c b/drivers/net/ethernet/marvell/skge.c
index 04fd1f135011f1a068bbc79991af0d05a7c56583..654ac534b10e3e8e04911b618d5fd1cb6fb5c8c8 100644 (file)
--- a/drivers/net/ethernet/marvell/skge.c
+++ b/drivers/net/ethernet/marvell/skge.c
@@ -152,8 +152,10 @@ static void skge_get_regs(struct net_device *dev, struct ethtool_regs *regs,
        memset(p, 0, regs->len);
        memcpy_fromio(p, io, B3_RAM_ADDR);
 
-       memcpy_fromio(p + B3_RI_WTO_R1, io + B3_RI_WTO_R1,
-                     regs->len - B3_RI_WTO_R1);
+       if (regs->len > B3_RI_WTO_R1) {
+               memcpy_fromio(p + B3_RI_WTO_R1, io + B3_RI_WTO_R1,
+                             regs->len - B3_RI_WTO_R1);
+       }
 }
 
 /* Wake on Lan only supported on Yukon chips with rev 1 or above */