@@ -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)
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> --- drivers/net/ethernet/sun/sunvnet.c | 21 +++++++++++---------- 1 files changed, 11 insertions(+), 10 deletions(-)