[cpp-opensaml] 02/04: CPPXT-121 Fix potential signed overflow

[Scott Cantor]

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scantor pushed a commit to branch maint-2
in repository cpp-opensaml.

View the commit online:
http://git.shibboleth.net/view/?p=cpp-opensaml.git;a=commit;h=4f54d00804a564a985619025bceaacf174384f4a

commit 4f54d00804a564a985619025bceaacf174384f4a
Author: Rod Widdowson <rdw at steadingsoftware.com>
AuthorDate: Tue Aug 15 17:32:38 2017 +0100

    CPPXT-121 Fix potential signed overflow
    
    https://issues.shibboleth.net/jira/browse/CPPXT-121
---
 saml/saml2/metadata/impl/DynamicMetadataProvider.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/saml/saml2/metadata/impl/DynamicMetadataProvider.cpp b/saml/saml2/metadata/impl/DynamicMetadataProvider.cpp
index 86631bb..7ca8d6e 100644
--- a/saml/saml2/metadata/impl/DynamicMetadataProvider.cpp
+++ b/saml/saml2/metadata/impl/DynamicMetadataProvider.cpp
@@ -50,9 +50,14 @@ using namespace xmltooling::logging;
 using namespace xmltooling;
 using namespace std;
 
+#include <limits>
+
 # ifndef min
 #  define min(a,b)            (((a) < (b)) ? (a) : (b))
 # endif
+# ifdef max
+# undef max
+# endif
 
 static const XMLCh id[] =                   UNICODE_LITERAL_2(i,d);
 static const XMLCh cleanupInterval[] =      UNICODE_LITERAL_15(c,l,e,a,n,u,p,I,n,t,e,r,v,a,l);
@@ -301,7 +306,10 @@ pair<const EntityDescriptor*,const RoleDescriptor*> DynamicMetadataProvider::get
         doFilters(*entity2);
 
         time_t now = time(nullptr);
-        if (entity2->getValidUntil() && entity2->getValidUntilEpoch() < now + 60)
+	time_t cmp = now;
+	if (cmp < (std::numeric_limits<int>::max() - 60))
+	    cmp += 60;
+        if (entity2->getValidUntil() && entity2->getValidUntilEpoch() < cmp)
             throw MetadataException("Metadata was already invalid at the time of retrieval.");
 
         log.info("caching resolved metadata for (%s)", name.c_str());

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