diff --git a/src/libsodium/crypto_pwhash/scryptsalsa208sha256/nosse/pwhash_scryptsalsa208sha256_nosse.c b/src/libsodium/crypto_pwhash/scryptsalsa208sha256/nosse/pwhash_scryptsalsa208sha256_nosse.c
index b1c1bd84..5bf0d704 100644
--- a/src/libsodium/crypto_pwhash/scryptsalsa208sha256/nosse/pwhash_scryptsalsa208sha256_nosse.c
+++ b/src/libsodium/crypto_pwhash/scryptsalsa208sha256/nosse/pwhash_scryptsalsa208sha256_nosse.c
@@ -305,6 +305,10 @@ escrypt_kdf_nosse(escrypt_local_t *local, const uint8_t *passwd,
     uint32_t  i;
 
 /* Sanity-check parameters. */
+    if (r == 0 || p == 0) {
+        errno = EINVAL;
+        return -1;
+    }
 #if SIZE_MAX > UINT32_MAX
     if (buflen > (((uint64_t)(1) << 32) - 1) * 32) {
         errno = EFBIG;
diff --git a/src/libsodium/crypto_pwhash/scryptsalsa208sha256/sse/pwhash_scryptsalsa208sha256_sse.c b/src/libsodium/crypto_pwhash/scryptsalsa208sha256/sse/pwhash_scryptsalsa208sha256_sse.c
index 754a19fd..688f2d30 100644
--- a/src/libsodium/crypto_pwhash/scryptsalsa208sha256/sse/pwhash_scryptsalsa208sha256_sse.c
+++ b/src/libsodium/crypto_pwhash/scryptsalsa208sha256/sse/pwhash_scryptsalsa208sha256_sse.c
@@ -317,6 +317,10 @@ escrypt_kdf_sse(escrypt_local_t *local, const uint8_t *passwd, size_t passwdlen,
     uint32_t  i;
 
 /* Sanity-check parameters. */
+    if (r == 0 || p == 0) {
+        errno = EINVAL;
+        return -1;
+    }
 # if SIZE_MAX > UINT32_MAX
 /* LCOV_EXCL_START */
     if (buflen > (((uint64_t)(1) << 32) - 1) * 32) {