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s390/qeth: fix error handling in checksum cmd callback

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

Fixes: c9475369bd ("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>
This commit is contained in:
Julian Wiedmann 2017-12-20 18:07:18 +01:00 committed by David S. Miller
parent bb25c3855a
commit ad3cbf6133
1 changed files with 8 additions and 1 deletions
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9
drivers/s390/net/qeth_core_main.c
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@ -5386,6 +5386,13 @@ int qeth_poll(struct napi_struct *napi, int budget)
}
EXPORT_SYMBOL_GPL(qeth_poll);
static int qeth_setassparms_inspect_rc(struct qeth_ipa_cmd *cmd)
{
if (!cmd->hdr.return_code)
cmd->hdr.return_code = cmd->data.setassparms.hdr.return_code;
return cmd->hdr.return_code;
}
int qeth_setassparms_cb(struct qeth_card *card,
struct qeth_reply *reply, unsigned long data)
{
@ -6242,7 +6249,7 @@ static int qeth_ipa_checksum_run_cmd_cb(struct qeth_card *card,
(struct qeth_checksum_cmd *)reply->param;
QETH_CARD_TEXT(card, 4, "chkdoccb");
if (cmd->hdr.return_code)
if (qeth_setassparms_inspect_rc(cmd))
return 0;
memset(chksum_cb, 0, sizeof(*chksum_cb));