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

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

Fixes: addde1f2c9 ("crypto: akcipher - Add sync interface without SG lists")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-06-27 17:59:32 +08:00
parent 891ebfdfa3
commit 486bfb0591
1 changed files with 2 additions and 1 deletions
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3
crypto/akcipher.c
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@ -234,7 +234,8 @@ EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep);
int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err) int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err)
{ {
err = crypto_wait_req(err, &data->cwait); 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; data->dlen = data->req->dst_len;
kfree_sensitive(data->req); kfree_sensitive(data->req);
return err; return err;