--- /n/sources/plan9/sys/src/cmd/ssh2/netssh.c	Thu Apr 19 10:50:04 2012
+++ /sys/src/cmd/ssh2/netssh.c	Tue Sep 22 00:00:00 2026
@@ -1934,7 +1934,12 @@
 		p = path;
 		n = 0;
 		do {
-			if (ioread(io, fd, p, 1) < 0) {
+			if (n >= sizeof path - 1) {
+				sshlog(c, "ID string too long in ID exchange");
+				close(fd);
+				goto err;
+			}
+			if (ioread(io, fd, p, 1) != 1) {
 				*p = '\0';
 				sshlog(c, "short read after %d bytes "
 					"in ID exchange: %s: %r\n", n, path);