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tcp: fix signed/unsigned comparison 

Kernel test robot reported:

smatch warnings:
net/ipv4/tcp_input.c:5966 tcp_rcv_established() warn: unsigned 'reason' is never less than zero.

I actually had one packetdrill failing because of this bug,
and was about to send the fix :)

v2: Andreas Schwab also pointed out that @reason needs to be negated
    before we reach tcp_drop_reason()

Fixes: 4b506af9c5 ("tcp: add two drop reasons for tcp_ack()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-04-17 11:34:32 -07:00 committed by David S. Miller
parent 53c33a16d0
commit 843f77407e
1 changed files with 3 additions and 2 deletions
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5
net/ipv4/tcp_input.c
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@ -5959,9 +5959,10 @@ slow_path:
step5:
reason = tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT);
if (reason < 0)
if ((int)reason < 0) {
reason = -reason;
goto discard;
}
tcp_rcv_rtt_measure_ts(sk, skb);
/* Process urgent data. */