[PATCH nft,v2] monitor: too large shift exponent displaying payload expression

[Pablo Neira Ayuso <pablo@netfilter.org>]

ASAN reports too large shift exponent when displaying traces for raw
payload expression:

  trace id ec23e848 ip x y packet: oif "wlan0" src/netlink.c:2100:32: runtime error: shift exponent 1431657095 is too large for 32-bit type 'int'

skip if proto_unknown_template is set on in this payload expression.

Fixes: be5d9120e81e ("nft monitor [ trace ]")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: check for proto_unknown_template, otherwise problem persists.

 src/netlink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/netlink.c b/src/netlink.c
index 0088b742d573..efb0b69939dc 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -2096,6 +2096,7 @@ restart:
 		/* Skip unknown and filtered expressions */
 		desc = lhs->payload.desc;
 		if (lhs->dtype == &invalid_type ||
+		    lhs->payload.tmpl == &proto_unknown_template ||
 		    desc->checksum_key == payload_hdr_field(lhs) ||
 		    desc->format.filter & (1 << payload_hdr_field(lhs))) {
 			expr_free(lhs);
-- 
2.30.2