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net: ethtool: avoid OOB accesses in PAUSE_SET

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We now reuse .parse_request() from GET on SET, so we need to make sure
that the policies for both cover the attributes used for .parse_request().
genetlink will only allocate space in info->attrs for ARRAY_SIZE(policy).

Reported-by: syzbot+430f9f76633641a62217@syzkaller.appspotmail.com
Fixes: 963781bdfe ("net: ethtool: call .parse_request for SET handlers")
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20250626233926.199801-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2025-06-26 16:39:26 -07:00
parent 7012d4f3c7
commit 99e3eb454c
2 changed files with 2 additions and 1 deletions
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2
net/ethtool/netlink.h
View File

@@ -467,7 +467,7 @@ extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMB
extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1];
extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1];
extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_STATS_SRC + 1];
extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1];
extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_STATS_SRC + 1];
extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1];
extern const struct nla_policy ethnl_eee_set_policy[ETHTOOL_A_EEE_TX_LPI_TIMER + 1];
extern const struct nla_policy ethnl_tsinfo_get_policy[ETHTOOL_A_TSINFO_MAX + 1];

1
net/ethtool/pause.c
View File

@@ -168,6 +168,7 @@ const struct nla_policy ethnl_pause_set_policy[] = {
[ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
[ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
[ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
[ETHTOOL_A_PAUSE_STATS_SRC] = { .type = NLA_REJECT },
};
static int