1 files changed, 3 insertions, 1 deletions

diff --git a/lib/libalpm/util.h b/lib/libalpm/util.h
index e9e0af1f..6849fa19 100644
--- a/lib/libalpm/util.h
+++ b/lib/libalpm/util.h
@@ -43,7 +43,8 @@
 
 #define MALLOC(p, s, action) do { p = calloc(1, s); if(p == NULL) { ALLOC_FAIL(s); action; } } while(0)
 #define CALLOC(p, l, s, action) do { p = calloc(l, s); if(p == NULL) { ALLOC_FAIL(s); action; } } while(0)
-#define STRDUP(r, s, action) do { r = strdup(s); if(r == NULL) { ALLOC_FAIL(strlen(s)); action; } } while(0)
+/* This strdup macro is NULL safe- copying NULL will yield NULL */
+#define STRDUP(r, s, action) do { if(s != NULL) { r = strdup(s); if(r == NULL) { ALLOC_FAIL(strlen(s)); action; } } else { r = NULL; } } while(0)
 
 #define FREE(p) do { if(p) { free(p); p = NULL; } } while(0)
 
@@ -64,6 +65,7 @@ int _alpm_str_cmp(const void *s1, const void *s2);
 char *_alpm_filecache_find(const char *filename);
 const char *_alpm_filecache_setup(void);
 int _alpm_lstat(const char *path, struct stat *buf);
+int _alpm_test_md5sum(const char *filepath, const char *md5sum);
 
 #ifndef HAVE_STRVERSCMP
 int strverscmp(const char *, const char *);