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extra check if malloc failed

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This commit is contained in:
iceman1001
2020-02-03 22:44:46 +01:00
parent 9bf26c080d
commit 5ef1f001dd
1 changed files with 3 additions and 1 deletions
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4
common/crapto1/crapto1.c
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@@ -376,6 +376,7 @@ uint32_t lfsr_rollback_word(struct Crypto1State *s, uint32_t in, int fb) {
static uint16_t *dist = 0;
int nonce_distance(uint32_t from, uint32_t to) {
if (!dist) {
// allocation 2bytes * 0xFFFF times.
dist = calloc(2 << 16, sizeof(uint8_t));
if (!dist)
return -1;
@@ -396,7 +397,8 @@ int nonce_distance(uint32_t from, uint32_t to) {
*/
bool validate_prng_nonce(uint32_t nonce) {
// init prng table:
nonce_distance(nonce, nonce);
if (nonce_distance(nonce, nonce) == -1)
return false;
return ((65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535) == 16;
}