[PATCH v2] net/ixgbe: fix null dereference on EEPROM write for E610

[Sandeep Penigalapati <sandeep.penigalapati@intel.com>]

E610 does not support EEPROM writes and leaves eeprom.ops.write_buffer
as NULL. ixgbe_set_eeprom() calls this pointer without checking it,
causing a NULL pointer dereference when a set-eeprom request is issued
on an E610 port.

Check the op for NULL and return -ENOTSUP instead.

Fixes: 316637762a5f ("net/ixgbe/base: enable E610 device")
Cc: stable@dpdk.org

Signed-off-by: Sandeep Penigalapati <sandeep.penigalapati@intel.com>
---
v2:
 - Moved the NULL check before the argument validation so an
   unsupported request returns -ENOTSUP instead of -EINVAL.

 drivers/net/intel/ixgbe/ixgbe_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/intel/ixgbe/ixgbe_ethdev.c b/drivers/net/intel/ixgbe/ixgbe_ethdev.c
index 78e19f94c0..b7b2b92e3c 100644
--- a/drivers/net/intel/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/intel/ixgbe/ixgbe_ethdev.c
@@ -7362,6 +7362,9 @@ ixgbe_set_eeprom(struct rte_eth_dev *dev,
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return -E_RTE_SECONDARY;
 
+	if (eeprom->ops.write_buffer == NULL)
+		return -ENOTSUP;
+
 	first = in_eeprom->offset >> 1;
 	length = in_eeprom->length >> 1;
 	if ((first > hw->eeprom.word_size) ||
-- 
2.27.0