Commit 8acf7a10 authored Nov 21, 2016 by Herbert Xu

crypto: algif_hash - Fix result clobbering in recvmsg



Recently an init call was added to hash_recvmsg so as to reset
the hash state in case a sendmsg call was never made.

Unfortunately this ended up clobbering the result if the previous
sendmsg was done with a MSG_MORE flag.  This patch fixes it by
excluding that case when we make the init call.

Fixes: a8348bca ("algif_hash - Fix NULL hash crash with shash")
Reported-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent a8348bca

crypto/algif_hash.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -214,7 +214,7 @@ static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,

		ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);

		if (!result) {
		if (!result && !ctx->more) {
		err = af_alg_wait_for_completion(
		crypto_ahash_init(&ctx->req),
		&ctx->completion);