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Do not allocate zero sized buffers - entropy

pull/10232/head
itayzafrir 2019-03-27 15:16:49 +02:00
parent 19b83812d4
commit abd9c661ce
1 changed files with 7 additions and 4 deletions
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11
components/TARGET_PSA/services/crypto/COMPONENT_SPE/psa_crypto_partition.c
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@ -1467,6 +1467,7 @@ static void psa_entropy_operation(void)
case PSA_IPC_CALL: {
#if (defined(MBEDTLS_ENTROPY_NV_SEED) && defined(MBEDTLS_PSA_HAS_ITS_IO))
unsigned char *seed = NULL;
uint32_t bytes_read;
size_t seed_size = msg.in_size[0];
if (MBEDTLS_ENTROPY_MAX_SEED_SIZE < seed_size) {
@ -1474,10 +1475,12 @@ static void psa_entropy_operation(void)
break;
}
unsigned char *seed = mbedtls_calloc(1, seed_size);
if (seed == NULL) {
status = PSA_ERROR_INSUFFICIENT_MEMORY;
break;
if (seed_size > 0) {
seed = mbedtls_calloc(1, seed_size);
if (seed == NULL) {
status = PSA_ERROR_INSUFFICIENT_MEMORY;
break;
}
}
bytes_read = psa_read(msg.handle, 0, seed, seed_size);