From cef3566998fcae6936d781e678c309950a8a5787 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Fri, 3 Oct 2014 20:57:30 -0400
Subject: [PATCH] sd-id128: do stricter checking of random boot id

If we are bothering to check whether the kernel is not feeding us
bad data, we might as well do it properly.

CID #1237692.
---
 src/libsystemd/sd-id128/sd-id128.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git src/libsystemd/sd-id128/sd-id128.c src/libsystemd/sd-id128/sd-id128.c
index a1e44e6..233ffa0 100644
--- src/libsystemd/sd-id128/sd-id128.c
+++ src/libsystemd/sd-id128/sd-id128.c
@@ -183,11 +183,14 @@ _public_ int sd_id128_get_boot(sd_id128_t *ret) {
         for (j = 0, p = buf; j < 16; j++) {
                 int a, b;
 
-                if (p >= buf + k)
+                if (p >= buf + k - 1)
                         return -EIO;
 
-                if (*p == '-')
+                if (*p == '-') {
                         p++;
+                        if (p >= buf + k - 1)
+                                return -EIO;
+                }
 
                 a = unhexchar(p[0]);
                 b = unhexchar(p[1]);
-- 
1.7.9.2

