From: Fletcher T. Penney <fletcher@fletcherpenney.net>
Date: Fri, 21 Jul 2017 14:22:45 +0000 (-0400)
Subject: FIXED: Improve safety of realpath
X-Git-Tag: 6.2.0^2~29
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ce6d4947521f2d8fcae0a7c28913b09b61ab0a56;p=multimarkdown

FIXED: Improve safety of realpath
---

diff --git a/Sources/multimarkdown/main.c b/Sources/multimarkdown/main.c
index c4af761..0aedb88 100644
--- a/Sources/multimarkdown/main.c
+++ b/Sources/multimarkdown/main.c
@@ -55,6 +55,7 @@
 
 #include <ctype.h>
 #include <libgen.h>
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -483,10 +484,16 @@ int main(int argc, char** argv) {
 			// Perform transclusion(s)
             
             // Convert to absolute path for first file to enable proper path resolution
-            char absolute[1025];
-            realpath(a_file->filename[0], absolute);
 
+#ifdef PATH_MAX
+            char absolute[PATH_MAX + 1];
+            realpath(a_file->filename[0], absolute);
             mmd_transclude_source(buffer, folder, absolute, format, NULL, NULL);
+#else
+            char * absolute = realpath(a_file->filename[0], NULL);
+            mmd_transclude_source(buffer, folder, absolute, format, NULL, NULL);
+            free(absolute);
+#endif
 			// Don't free folder -- owned by dirname
 		}