From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 27 Jun 2023 09:59:32 +0000 (+0800)
Subject: crypto: akcipher - Do not copy dst if it is NULL
X-Git-Tag: v6.6.7~2481^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=486bfb05913ac9969a3a71a4dc48f17f31cb162d;p=platform%2Fkernel%2Flinux-starfive.git

crypto: akcipher - Do not copy dst if it is NULL

As signature verification has a NULL destination buffer, the pointer
needs to be checked before the memcpy is done.

Fixes: addde1f2c966 ("crypto: akcipher - Add sync interface without SG lists")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index e9b6ddc..52813f0 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -234,7 +234,8 @@ EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep);
 int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err)
 {
 	err = crypto_wait_req(err, &data->cwait);
-	memcpy(data->dst, data->buf, data->dlen);
+	if (data->dst)
+		memcpy(data->dst, data->buf, data->dlen);
 	data->dlen = data->req->dst_len;
 	kfree_sensitive(data->req);
 	return err;