Add a return value to signer_t.allocate_signature()

src/libstrongswan/crypto/aead.c

@@ -52,7 +52,10 @@ METHOD(aead_t, encrypt, bool,
 	if (encrypted)
 	{
 		this->crypter->encrypt(this->crypter, plain, iv, &encr);
-		this->signer->allocate_signature(this->signer, encr, &sig);
+		if (!this->signer->allocate_signature(this->signer, encr, &sig))
+		{
+			return FALSE;
+		}
 		*encrypted = chunk_cat("cmm", iv, encr, sig);
 	}
 	else

src/libstrongswan/crypto/crypto_tester.c

@@ -547,7 +547,10 @@ METHOD(crypto_tester_t, test_signer, bool,
 
 		/* allocated signature */
 		data = chunk_create(vector->data, vector->len);
-		signer->allocate_signature(signer, data, &mac);
+		if (!signer->allocate_signature(signer, data, &mac))
+		{
+			failed = TRUE;
+		}
 		if (mac.len != signer->get_block_size(signer))
 		{
 			failed = TRUE;
@@ -577,7 +580,11 @@ METHOD(crypto_tester_t, test_signer, bool,
 		/* signature to existing buffer, using append mode */
 		if (data.len > 2)
 		{
-			signer->allocate_signature(signer, chunk_create(data.ptr, 1), NULL);
+			if (!signer->allocate_signature(signer,
+											chunk_create(data.ptr, 1), NULL))
+			{
+				failed = TRUE;
+			}
 			signer->get_signature(signer, chunk_create(data.ptr + 1, 1), NULL);
 			if (!signer->verify_signature(signer, chunk_skip(data, 2),
 										  chunk_create(vector->mac, mac.len)))

src/libstrongswan/crypto/signers/mac_signer.c

@@ -56,7 +56,7 @@ METHOD(signer_t, get_signature, void,
 	}
 }
 
-METHOD(signer_t, allocate_signature, void,
+METHOD(signer_t, allocate_signature, bool,
 	private_signer_t *this, chunk_t data, chunk_t *chunk)
 {
 	if (chunk == NULL)
@@ -72,6 +72,7 @@ METHOD(signer_t, allocate_signature, void,
 		*chunk = chunk_alloc(this->truncation);
 		memcpy(chunk->ptr, mac, this->truncation);
 	}
+	return TRUE;
 }
 
 METHOD(signer_t, verify_signature, bool,

src/libstrongswan/crypto/signers/signer.h

@@ -102,8 +102,10 @@ struct signer_t {
 	 *
 	 * @param data		a chunk containing the data to sign
 	 * @param chunk		chunk which will hold the allocated signature
+	 * @return			TRUE if signature allocated successfully
 	 */
-	void (*allocate_signature) (signer_t *this, chunk_t data, chunk_t *chunk);
+	__attribute__((warn_unused_result))
+	bool (*allocate_signature) (signer_t *this, chunk_t data, chunk_t *chunk);
 
 	/**
 	 * Verify a signature.

src/libstrongswan/plugins/af_alg/af_alg_signer.c

@@ -113,7 +113,7 @@ METHOD(signer_t, get_signature, void,
 	this->ops->hash(this->ops, data, buffer, this->block_size);
 }
 
-METHOD(signer_t, allocate_signature, void,
+METHOD(signer_t, allocate_signature, bool,
 	private_af_alg_signer_t *this, chunk_t data, chunk_t *chunk)
 {
 	if (chunk)
@@ -125,6 +125,7 @@ METHOD(signer_t, allocate_signature, void,
 	{
 		get_signature(this, data, NULL);
 	}
+	return TRUE;
 }
 
 METHOD(signer_t, verify_signature, bool,

src/libtls/tls_protection.c

@@ -220,7 +220,11 @@ METHOD(tls_protection_t, build, status_t,
 
 			sigheader(this->signer_out, this->seq_out, *type,
 					  this->version, data->len);
-			this->signer_out->allocate_signature(this->signer_out, *data, &mac);
+			if (!this->signer_out->allocate_signature(this->signer_out,
+													  *data, &mac))
+			{
+				return FAILED;
+			}
 			if (this->crypter_out)
 			{
 				chunk_t padding, iv;