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--- a/ltq_atm.c
+++ b/ltq_atm.c
@@ -338,7 +338,8 @@ static int ppe_ioctl(struct atm_dev *dev
break;
case PPE_ATM_MIB_VCC: /* VCC related MIB */
- copy_from_user(&mib_vcc, arg, sizeof(mib_vcc));
+ if (copy_from_user(&mib_vcc, arg, sizeof(mib_vcc)))
+ return -EFAULT;
conn = find_vpivci(mib_vcc.vpi, mib_vcc.vci);
if (conn >= 0) {
mib_vcc.mib_vcc.aal5VccCrcErrors = g_atm_priv_data.conn[conn].aal5_vcc_crc_err;
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