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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 <jmaloy@redhat.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Link: https://lore.kernel.org/r/20201215033151.76139-1-hoang.h.le@dektech.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Hoang Le 2020-12-15 10:31:51 +07:00 committed by Jakub Kicinski
parent 023cae857b
commit c32c928d29
1 changed files with 7 additions and 5 deletions
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12
net/tipc/netlink_compat.c
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@ -213,12 +213,14 @@ static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
} }
info.attrs = attrbuf; 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 { do {
int rem; int rem;