Index: sys/net/bpf.c
===================================================================
RCS file: /cvs/src/sys/net/bpf.c,v
diff -u -p -r1.222 bpf.c
--- sys/net/bpf.c	26 Jan 2024 21:14:08 -0000	1.222
+++ sys/net/bpf.c	2 Aug 2024 13:11:11 -0000
@@ -731,6 +731,8 @@ bpf_set_wtimeout(struct bpf_d *d, const 
 		return (EINVAL);
 
 	nsec = TIMEVAL_TO_NSEC(tv);
+	if (nsec > SEC_TO_NSEC(300))
+		return (EINVAL);
 	if (nsec > MAXTSLP)
 		return (EOVERFLOW);
 
Index: share/man/man4/bpf.4
===================================================================
RCS file: /cvs/src/share/man/man4/bpf.4,v
diff -u -p -r1.45 bpf.4
--- share/man/man4/bpf.4	9 Mar 2023 06:01:40 -0000	1.45
+++ share/man/man4/bpf.4	2 Aug 2024 13:11:11 -0000
@@ -315,6 +315,7 @@ the kernel buffer becoming readable.
 By default, or when reset, the wait timeout is infinite, meaning
 the age of packets in the kernel buffer does not make the buffer
 readable.
+The maximum wait time that can be set is 5 minutes (300 seconds).
 .Pp
 .It Dv BIOCSETF Fa "struct bpf_program *"
 Sets the filter program used by the kernel to discard uninteresting packets.