crypto: user - Fix size of netlink dump message

The default netlink message size limit might be exceeded when dumping a
lot of algorithms to userspace. As a result, not all of the instantiated
algorithms dumped to userspace. So calculate an upper bound on the message
size and call netlink_dump_start() with that value.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 8 insertions, 0 deletions

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index e91c16111ed3..f1ea0a064135 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -457,12 +457,20 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
         if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
             (nlh->nlmsg_flags & NLM_F_DUMP))) {
+                struct crypto_alg *alg;
+                u16 dump_alloc = 0;
+
                 if (link->dump == NULL)
                         return -EINVAL;
+
+                list_for_each_entry(alg, &crypto_alg_list, cra_list)
+                        dump_alloc += CRYPTO_REPORT_MAXSIZE;
+
                 {
                         struct netlink_dump_control c = {
                                 .dump = link->dump,
                                 .done = link->done,
+                                .min_dump_alloc = dump_alloc,
                         };
                         return netlink_dump_start(crypto_nlsk, skb, nlh, &c);
                 }