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sunvnet: free pending tx buffers before clearing ring data

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This patch moves the clearing of ring data in vnet_port_free_tx_bufs to after
 the freeing of pending buffers in the ring. Otherwise, this can result in
 dereferencing a NULL pointer.

Reported-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David L Stevens 2015-01-26 15:54:35 -05:00 committed by David S. Miller
parent 971f49dee2
commit 07ac3e7099
1 changed files with 11 additions and 10 deletions
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21
drivers/net/ethernet/sun/sunvnet.c
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@ -1637,16 +1637,9 @@ static void vnet_port_free_tx_bufs(struct vnet_port *port)
int i;
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
if (dr->base) {
ldc_free_exp_dring(port->vio.lp, dr->base,
(dr->entry_size * dr->num_entries),
dr->cookies, dr->ncookies);
dr->base = NULL;
dr->entry_size = 0;
dr->num_entries = 0;
dr->pending = 0;
dr->ncookies = 0;
}
if (dr->base == NULL)
return;
for (i = 0; i < VNET_TX_RING_SIZE; i++) {
struct vio_net_desc *d;
@ -1666,6 +1659,14 @@ static void vnet_port_free_tx_bufs(struct vnet_port *port)
port->tx_bufs[i].skb = NULL;
d->hdr.state = VIO_DESC_FREE;
}
ldc_free_exp_dring(port->vio.lp, dr->base,
(dr->entry_size * dr->num_entries),
dr->cookies, dr->ncookies);
dr->base = NULL;
dr->entry_size = 0;
dr->num_entries = 0;
dr->pending = 0;
dr->ncookies = 0;
}
static int vnet_port_alloc_tx_ring(struct vnet_port *port)