Bug#632457: mount.nfs segfaults with 2-component kernel version number (like 3.0)

[Michael Tokarev <mjt@tls.msk.ru>]

Package: nfs-common
Version: 1:1.2.3-3
Severity: normal
Tags: upstream

mount.nfs segfaults if kernel version number does not contain
at least 3 components delimited with a dot.

The following patch fixes it somehow, but it's wrong because
it does not take into account that a dot may be part of, say,
debian release number like 3.0-debian3.0.1 for example.

--- nfs-utils-1.2.3.orig/utils/mount/version.h
+++ nfs-utils-1.2.3/utils/mount/version.h
@@ -38,13 +38,15 @@ static inline unsigned int linux_version
 {
 	struct utsname my_utsname;
 	unsigned int p, q, r;
+	const char *rp;
 
 	if (uname(&my_utsname))
 		return 0;
 
 	p = atoi(strtok(my_utsname.release, "."));
 	q = atoi(strtok(NULL, "."));
-	r = atoi(strtok(NULL, "."));
+	rp = strtok(NULL, ".");
+	r = rp ? atoi(rp) : 0;
 	return MAKE_VERSION(p, q, r);
 }