rdkafka_broker.c: Potential Interger Overflow

[stasos24]

Since inflight_cnt, retry_cnt, outq_cnt has int type

librdkafka/src/rdkafka_broker.c

Lines 941 to 942 in 9387761

	static void rd_kafka_broker_timeout_scan(rd_kafka_broker_t *rkb, rd_ts_t now) {
	int inflight_cnt, retry_cnt, outq_cnt;

And rd_atomic64_add accepts two int64

librdkafka/src/rdatomic.h

Lines 144 to 145 in 9387761

	static RD_INLINE int64_t RD_UNUSED rd_atomic64_add(rd_atomic64_t *ra,
	int64_t v) {

There is possible integer overflow at:

librdkafka/src/rdkafka_broker.c

Lines 969 to 970 in 9387761

	rd_atomic64_add(&rkb->rkb_c.req_timeouts,
	inflight_cnt + outq_cnt);

Possible fix:
<static_cast>(int64) inflight_cnt + outq_cnt