From f666ad4f8d87e3a9189c2c9c4b995aaa6dbf3e3f Mon Sep 17 00:00:00 2001 From: Leon Romanovsky Date: Mon, 5 Apr 2021 10:44:34 +0300 Subject: [PATCH] RDMA/addr: Be strict with gid size [ Upstream commit d1c803a9ccd7bd3aff5e989ccfb39ed3b799b975 ] The nla_len() is less than or equal to 16. If it's less than 16 then end of the "gid" buffer is uninitialized. Fixes: ae43f8286730 ("IB/core: Add IP to GID netlink offload") Link: https://lore.kernel.org/r/20210405074434.264221-1-leon@kernel.org Reported-by: Dan Carpenter Signed-off-by: Mark Bloch Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/core/addr.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c index 8beed4197e73..c9e63c692b6e 100644 --- a/drivers/infiniband/core/addr.c +++ b/drivers/infiniband/core/addr.c @@ -76,7 +76,9 @@ static struct workqueue_struct *addr_wq; static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = { [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY, - .len = sizeof(struct rdma_nla_ls_gid)}, + .len = sizeof(struct rdma_nla_ls_gid), + .validation_type = NLA_VALIDATE_MIN, + .min = sizeof(struct rdma_nla_ls_gid)}, }; static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)