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net/gnrc_lorawan: fix random_uint32_range upper bound

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This commit is contained in:
Jose Alamos 2021-07-21 03:12:30 +02:00
parent 0ffd04c132
commit 179a2c2780
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1 changed files with 2 additions and 2 deletions
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sys/net/gnrc/link_layer/lorawan/gnrc_lorawan_region.c
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@ -100,10 +100,10 @@ uint32_t gnrc_lorawan_pick_channel(gnrc_lorawan_t *mac)
{ {
uint8_t index = 0; uint8_t index = 0;
uint8_t random_number = random_uint32_range(0, bitarithm_bits_set(mac->channel_mask)); uint8_t pos = random_uint32_range(0, bitarithm_bits_set(mac->channel_mask));
unsigned state = mac->channel_mask; unsigned state = mac->channel_mask;
for (int i = 0; i < random_number; i++) { for (int i = 0; i < pos + 1; i++) {
state = bitarithm_test_and_clear(state, &index); state = bitarithm_test_and_clear(state, &index);
} }
return mac->channel[index]; return mac->channel[index];