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ibmvnic fix NULL tx_pools and rx_tools issue at do_reset

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At the time of do_rest, ibmvnic tries to re-initalize the tx_pools
and rx_pools to avoid re-allocating the long term buffer. However
there is a window inside do_reset that the tx_pools and
rx_pools were freed before re-initialized making it possible to deference
null pointers.

This patch fix this issue by always check the tx_pool
and rx_pool are not NULL after ibmvnic_login. If so, re-allocating
the pools. This will avoid getting into calling reset_tx/rx_pools with
NULL adapter tx_pools/rx_pools pointer. Also add null pointer check in
reset_tx_pools and reset_rx_pools to safe handle NULL pointer case.

Signed-off-by: Mingming Cao <mmc@linux.vnet.ibm.com>
Signed-off-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mingming Cao 2020-08-25 13:26:41 -04:00 committed by David S. Miller
parent 2c6500e82e
commit 9f13457377
1 changed files with 14 additions and 1 deletions
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15
drivers/net/ethernet/ibm/ibmvnic.c
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@ -479,6 +479,9 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter)
int i, j, rc;
u64 *size_array;
if (!adapter->rx_pool)
return -1;
size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
@ -649,6 +652,9 @@ static int reset_tx_pools(struct ibmvnic_adapter *adapter)
int tx_scrqs;
int i, rc;
if (!adapter->tx_pool)
return -1;
tx_scrqs = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
for (i = 0; i < tx_scrqs; i++) {
rc = reset_one_tx_pool(adapter, &adapter->tso_pool[i]);
@ -2011,7 +2017,10 @@ static int do_reset(struct ibmvnic_adapter *adapter,
adapter->req_rx_add_entries_per_subcrq !=
old_num_rx_slots ||
adapter->req_tx_entries_per_subcrq !=
old_num_tx_slots) {
old_num_tx_slots ||
!adapter->rx_pool ||
!adapter->tso_pool ||
!adapter->tx_pool) {
release_rx_pools(adapter);
release_tx_pools(adapter);
release_napi(adapter);
@ -2024,10 +2033,14 @@ static int do_reset(struct ibmvnic_adapter *adapter,
} else {
rc = reset_tx_pools(adapter);
if (rc)
netdev_dbg(adapter->netdev, "reset tx pools failed (%d)\n",
rc);
goto out;
rc = reset_rx_pools(adapter);
if (rc)
netdev_dbg(adapter->netdev, "reset rx pools failed (%d)\n",
rc);
goto out;
}
ibmvnic_disable_irqs(adapter);