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net: ethtool: Handle missing cable test TDR parameters 

A last minute change put the TDR cable test parameters into a nest.
The validation is not sufficient, resulting in an oops if the nest is
missing. Set default values first, then update them if the nest is
provided.

Fixes: f2bc8ad31a ("net: ethtool: Allow PHY cable test TDR data to configured")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2020-06-24 03:25:45 +02:00 committed by David S. Miller
parent 54cc017c21
commit 4b973f4983
1 changed files with 9 additions and 8 deletions
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17
net/ethtool/cabletest.c
View File

@ -234,6 +234,14 @@ static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
struct nlattr *tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_MAX + 1];
int ret;
cfg->first = 100;
cfg->step = 100;
cfg->last = MAX_CABLE_LENGTH_CM;
cfg->pair = PHY_PAIR_ALL;
if (!nest)
return 0;
ret = nla_parse_nested(tb, ETHTOOL_A_CABLE_TEST_TDR_CFG_MAX, nest,
cable_test_tdr_act_cfg_policy, info->extack);
if (ret < 0)
@ -242,17 +250,12 @@ static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST])
cfg->first = nla_get_u32(
tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_FIRST]);
else
cfg->first = 100;
if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST])
cfg->last = nla_get_u32(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_LAST]);
else
cfg->last = MAX_CABLE_LENGTH_CM;
if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP])
cfg->step = nla_get_u32(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_STEP]);
else
cfg->step = 100;
if (tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR]) {
cfg->pair = nla_get_u8(tb[ETHTOOL_A_CABLE_TEST_TDR_CFG_PAIR]);
@ -263,8 +266,6 @@ static int ethnl_act_cable_test_tdr_cfg(const struct nlattr *nest,
"invalid pair parameter");
return -EINVAL;
}
} else {
cfg->pair = PHY_PAIR_ALL;
}
if (cfg->first > MAX_CABLE_LENGTH_CM) {