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ibmvnic: Check for NULL skb's in NAPI poll routine

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After introduction of commit d0869c0071, there were some instances of
RX queue entries from a previous session (before the device was closed
and reopened) returned to the NAPI polling routine. Since the corresponding
socket buffers were freed, this resulted in a panic on reopen. Include
a check for a NULL skb here to avoid this.

Fixes: d0869c0071 ("ibmvnic: Clean RX pool buffers during device close")
Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Falcon 2018-02-19 20:12:57 -06:00 committed by David S. Miller
parent 79c0ef3e85
commit abe27a885d
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/ibm/ibmvnic.c
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@ -1901,6 +1901,11 @@ restart_poll:
dev_kfree_skb_any(rx_buff->skb);
remove_buff_from_pool(adapter, rx_buff);
continue;
} else if (!rx_buff->skb) {
/* free the entry */
next->rx_comp.first = 0;
remove_buff_from_pool(adapter, rx_buff);
continue;
}
length = be32_to_cpu(next->rx_comp.len);