net: fix decoding of optval argument of [gs]etsockopt SOL_NETLINK

Tweak the parser to follow the kernel behaviour.

* net.c (print_getsockopt, print_setsockopt) <SOL_NETLINK>: Fetch and
print returned value as integer iff the length is >= sizeof(int),
otherwise print the address.
* NEWS: Mention this.

1 files changed, 14 insertions, 0 deletions

diff --git a/net.c b/net.c
index f3c6f6b81..3e355e388 100644
--- a/net.c
+++ b/net.c
@@ -601,6 +601,13 @@ print_getsockopt(struct tcb *const tcp, const unsigned int level,
 			return;
 		}
 		break;
+
+	case SOL_NETLINK:
+		if (len < (int) sizeof(int))
+			printaddr(addr);	/* unlikely */
+		else
+			printnum_int(tcp, addr, "%d");
+		return;
 	}
 
 	/* default arg printing */
@@ -825,6 +832,13 @@ print_setsockopt(struct tcb *const tcp, const unsigned int level,
 			return;
 		}
 		break;
+
+	case SOL_NETLINK:
+		if (len < (int) sizeof(int))
+			printaddr(addr);
+		else
+			printnum_int(tcp, addr, "%d");
+		return;
 	}
 
 	/* default arg printing */