ax25: Fix ax25_cb refcounting in ax25_ctl_ioctl
Use ax25_cb_put after ax25_find_cb in ax25_ctl_ioctl.
Reported-by: Bernard Pidoux F6BVP <f6bvp@free.fr>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Reviewed-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index d6b1b05..fbcac76 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -358,6 +358,7 @@
ax25_dev *ax25_dev;
ax25_cb *ax25;
unsigned int k;
+ int ret = 0;
if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
return -EFAULT;
@@ -388,57 +389,63 @@
case AX25_WINDOW:
if (ax25->modulus == AX25_MODULUS) {
if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
- return -EINVAL;
+ goto einval_put;
} else {
if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
- return -EINVAL;
+ goto einval_put;
}
ax25->window = ax25_ctl.arg;
break;
case AX25_T1:
if (ax25_ctl.arg < 1)
- return -EINVAL;
+ goto einval_put;
ax25->rtt = (ax25_ctl.arg * HZ) / 2;
ax25->t1 = ax25_ctl.arg * HZ;
break;
case AX25_T2:
if (ax25_ctl.arg < 1)
- return -EINVAL;
+ goto einval_put;
ax25->t2 = ax25_ctl.arg * HZ;
break;
case AX25_N2:
if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
- return -EINVAL;
+ goto einval_put;
ax25->n2count = 0;
ax25->n2 = ax25_ctl.arg;
break;
case AX25_T3:
if (ax25_ctl.arg < 0)
- return -EINVAL;
+ goto einval_put;
ax25->t3 = ax25_ctl.arg * HZ;
break;
case AX25_IDLE:
if (ax25_ctl.arg < 0)
- return -EINVAL;
+ goto einval_put;
ax25->idle = ax25_ctl.arg * 60 * HZ;
break;
case AX25_PACLEN:
if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
- return -EINVAL;
+ goto einval_put;
ax25->paclen = ax25_ctl.arg;
break;
default:
- return -EINVAL;
+ goto einval_put;
}
- return 0;
+out_put:
+ ax25_cb_put(ax25);
+ return ret;
+
+einval_put:
+ ret = -EINVAL;
+ goto out_put;
}
static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)