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s390/qeth: fix error handling in checksum cmd callback
authorJulian Wiedmann <jwi@linux.vnet.ibm.com>
Wed, 20 Dec 2017 17:07:18 +0000 (18:07 +0100)
committerDavid S. Miller <davem@davemloft.net>
Wed, 20 Dec 2017 20:11:49 +0000 (15:11 -0500)
commitad3cbf61332914711e5f506972b1dc9af8d62146
tree4d2dc91ffa39b5aa9d169c39a1af3446868b5a92
parentbb25c3855a12cc58e33cd7ee9b69943790fe35f7
s390/qeth: fix error handling in checksum cmd callback

Make sure to check both return code fields before processing the
response. Otherwise we risk operating on invalid data.

Fixes: c9475369bd2b ("s390/qeth: rework RX/TX checksum offload")
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/s390/net/qeth_core_main.c