Make sure that the value of "(now - hc->tx_lsndtime) / hc->tx_rto" is
properly limited when shifting 'u32 cwnd' with it, otherwise we can get:
[40850.963623] UBSAN: Undefined behaviour in net/dccp/ccids/ccid2.c:237:7
[40851.043858] shift exponent 67 is too large for 32-bit type 'unsigned int'
[40851.127163] CPU: 3 PID: 15940 Comm: netstress Tainted: G W E 4.18.0-rc7.x86_64 #1
...
[40851.377176] Call Trace:
[40851.408503] dump_stack+0xf1/0x17b
[40851.451331] ? show_regs_print_info+0x5/0x5
[40851.503555] ubsan_epilogue+0x9/0x7c
[40851.548363] __ubsan_handle_shift_out_of_bounds+0x25b/0x2b4
[40851.617109] ? __ubsan_handle_load_invalid_value+0x18f/0x18f
[40851.686796] ? xfrm4_output_finish+0x80/0x80
[40851.739827] ? lock_downgrade+0x6d0/0x6d0
[40851.789744] ? xfrm4_prepare_output+0x160/0x160
[40851.845912] ? ip_queue_xmit+0x810/0x1db0
[40851.895845] ? ccid2_hc_tx_packet_sent+0xd36/0x10a0 [dccp]
[40851.963530] ccid2_hc_tx_packet_sent+0xd36/0x10a0 [dccp]
[40852.029063] dccp_xmit_packet+0x1d3/0x720 [dccp]
[40852.086254] dccp_write_xmit+0x116/0x1d0 [dccp]
[40852.142412] dccp_sendmsg+0x428/0xb20 [dccp]
[40852.195454] ? inet_dccp_listen+0x200/0x200 [dccp]
[40852.254833] ? sched_clock+0x5/0x10
[40852.298508] ? sched_clock+0x5/0x10
[40852.342194] ? inet_create+0xdf0/0xdf0
[40852.388988] sock_sendmsg+0xd9/0x160
...
Fixes: 113ced1f52e5 ("dccp ccid-2: Perform congestion-window validation")
Signed-off-by: Alexey Kodanev <alexey.kodanev@xxxxxxxxxx>
---
net/dccp/ccids/ccid2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 2b75df4..2821180 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -234,7 +234,7 @@ static void ccid2_cwnd_restart(struct sock *sk, const u32 now)
/* don't reduce cwnd below the initial window (IW) */
restart_cwnd = min(cwnd, iwnd);
- cwnd >>= (now - hc->tx_lsndtime) / hc->tx_rto;
+ cwnd >>= min((now - hc->tx_lsndtime) / hc->tx_rto, 31U);
hc->tx_cwnd = max(cwnd, restart_cwnd);
hc->tx_cwnd_stamp = now;
--
1.8.3.1
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