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Fix crash in igmp_start_timer (#1826)

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This commit is contained in:
Ivan Grokhotkov
2016-05-06 19:45:21 +08:00
parent f266f8a2ff
commit 0b7f8f9773
1 changed files with 12 additions and 1 deletions
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13
tools/sdk/lwip/src/core/ipv4/igmp.c
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@ -703,11 +703,22 @@ static void
igmp_start_timer(struct igmp_group *group, u8_t max_time) igmp_start_timer(struct igmp_group *group, u8_t max_time)
{ {
/* ensure the input value is > 0 */ /* ensure the input value is > 0 */
#ifdef LWIP_RAND
if (max_time == 0) { if (max_time == 0) {
max_time = 1; max_time = 1;
} }
/* ensure the random value is > 0 */ /* ensure the random value is > 0 */
group->timer = (LWIP_RAND() % (max_time - 1)) + 1; group->timer = (LWIP_RAND() % max_time);
if (group->timer == 0) {
group->timer = 1;
}
#else /* LWIP_RAND */
/* ATTENTION: use this only if absolutely necessary! */
group->timer = max_time / 2;
if (group->timer == 0) {
group->timer = 1;
}
#endif /* LWIP_RAND */
} }
/** /**