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macsec: fix NULL dereference in macsec_upd_offload()

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macsec_upd_offload() gets the value of MACSEC_OFFLOAD_ATTR_TYPE
without checking its presence in the request message, and this causes
a NULL dereference. Fix it rejecting any configuration that does not
include this attribute.

Reported-and-tested-by: syzbot+7022ab7c383875c17eff@syzkaller.appspotmail.com
Fixes: dcb780fb27 ("net: macsec: add nla support for changing the offloading selection")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Davide Caratti 2020-04-06 11:38:29 +02:00 committed by David S. Miller
parent db1f00fb8f
commit aa81700cf2
1 changed files with 3 additions and 0 deletions
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3
drivers/net/macsec.c
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@ -2594,6 +2594,9 @@ static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
return PTR_ERR(dev);
macsec = macsec_priv(dev);
if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
return -EINVAL;
offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
if (macsec->offload == offload)
return 0;