From c32c928d29deb2636e5889f59305cc15b004909f Mon Sep 17 00:00:00 2001 From: Hoang Le Date: Tue, 15 Dec 2020 10:31:51 +0700 Subject: tipc: do sanity check payload of a netlink message When we initialize nlmsghdr with no payload inside tipc_nl_compat_dumpit() the parsing function returns -EINVAL. We fix it by making the parsing call conditional. Acked-by: Jon Maloy Signed-off-by: Hoang Le Link: https://lore.kernel.org/r/20201215033151.76139-1-hoang.h.le@dektech.com.au Signed-off-by: Jakub Kicinski --- net/tipc/netlink_compat.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'net/tipc') diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c index 82f154989418..5a1ce64039f7 100644 --- a/net/tipc/netlink_compat.c +++ b/net/tipc/netlink_compat.c @@ -213,12 +213,14 @@ static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd, } info.attrs = attrbuf; - err = nlmsg_parse_deprecated(cb.nlh, GENL_HDRLEN, attrbuf, - tipc_genl_family.maxattr, - tipc_genl_family.policy, NULL); - if (err) - goto err_out; + if (nlmsg_len(cb.nlh) > 0) { + err = nlmsg_parse_deprecated(cb.nlh, GENL_HDRLEN, attrbuf, + tipc_genl_family.maxattr, + tipc_genl_family.policy, NULL); + if (err) + goto err_out; + } do { int rem; -- cgit v1.2.3