thodg/cgminer

diff --git a/util.c b/util.c
index 0317adc..756b77d 100644
--- a/util.c
+++ b/util.c
@@ -2951,3 +2951,13 @@ bool cg_completion_timeout(void *fn, void *fnarg, int timeout)
 		pthread_cancel(pthread);
 	return !ret;
 }
+
+void _cg_memcpy(void *dest, const void *src, unsigned int n, const char *file, const char *func, const int line)
+{
+	if (unlikely(n < 1 || n > (1ul << 31))) {
+		applog(LOG_ERR, "ERR: Asked to memcpy %u bytes from %s %s():%d",
+			      n, file, func, line);
+		return;
+	}
+	memcpy(dest, src, n);
+}
diff --git a/util.h b/util.h
index e9edae1..13db85c 100644
--- a/util.h
+++ b/util.h
@@ -157,11 +157,13 @@ int _cgsem_mswait(cgsem_t *cgsem, int ms, const char *file, const char *func, co
 void cgsem_reset(cgsem_t *cgsem);
 void cgsem_destroy(cgsem_t *cgsem);
 bool cg_completion_timeout(void *fn, void *fnarg, int timeout);
+void _cg_memcpy(void *dest, const void *src, unsigned int n, const char *file, const char *func, const int line);
 
 #define cgsem_init(_sem) _cgsem_init(_sem, __FILE__, __func__, __LINE__)
 #define cgsem_post(_sem) _cgsem_post(_sem, __FILE__, __func__, __LINE__)
 #define cgsem_wait(_sem) _cgsem_wait(_sem, __FILE__, __func__, __LINE__)
 #define cgsem_mswait(_sem, _timeout) _cgsem_mswait(_sem, _timeout, __FILE__, __func__, __LINE__)
+#define cg_memcpy(dest, src, n) _cg_memcpy(dest, src, n, __FILE__, __func__, __LINE__)
 
 /* Align a size_t to 4 byte boundaries for fussy arches */
 static inline void align_len(size_t *len)