Fix strdup() bug when USE_ZEND_ALLOC is disabled

Author: zsuraski

Zend/zend_alloc.c

@@ -409,6 +409,15 @@ ZEND_API char *_estrdup(const char *s ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
 	return p;
 }
 
+#if !USE_ZEND_ALLOC
+char *_strndup(char *s, uint l)
+{
+	char *tmp = malloc(l+1);
+	tmp[l] = '\0';
+	memcpy(tmp, s, l);
+	return tmp;
+}
+#endif
 
 ZEND_API char *_estrndup(const char *s, uint length ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
 {

Zend/zend_alloc.h

@@ -134,6 +134,8 @@ ZEND_API char *_estrndup(const char *s, unsigned int length ZEND_FILE_LINE_DC ZE
 #include <string.h>
 #undef _GNU_SOURCE
 
+char *_strndup(char *s, uint l);
+																 
 /* Standard wrapper macros */
 #define emalloc(size)					malloc(size)
 #define safe_emalloc(nmemb, size, offset)		malloc((nmemb) * (size) + (offset))
@@ -142,7 +144,7 @@ ZEND_API char *_estrndup(const char *s, unsigned int length ZEND_FILE_LINE_DC ZE
 #define erealloc(ptr, size)				realloc((ptr), (size))
 #define erealloc_recoverable(ptr, size)	realloc((ptr), (size))
 #define estrdup(s)						strdup(s)
-#define estrndup(s, length)				strndup((s), (length))
+#define estrndup(s, length)				_strndup((s), (length))
 
 /* Relay wrapper macros */
 #define emalloc_rel(size)					malloc(size)
@@ -152,7 +154,7 @@ ZEND_API char *_estrndup(const char *s, unsigned int length ZEND_FILE_LINE_DC ZE
 #define erealloc_rel(ptr, size)				realloc((ptr), (size))
 #define erealloc_recoverable_rel(ptr, size)	realloc((ptr), (size))
 #define estrdup_rel(s)						strdup(s)
-#define estrndup_rel(s, length)				strndup((s), (length))
+#define estrndup_rel(s, length)				_strndup((s), (length))
 
 /* Selective persistent/non persistent allocation macros */
 #define pemalloc(size, persistent)		malloc(size)
@@ -171,7 +173,7 @@ ZEND_API char *_estrndup(const char *s, unsigned int length ZEND_FILE_LINE_DC ZE
 #define pestrdup_rel(s, persistent)			strdup(s)
 
 #define safe_estrdup(ptr)  ((ptr)?(strdup(ptr)):(empty_string))
-#define safe_estrndup(ptr, len) ((ptr)?(strndup((ptr), (len))):(empty_string))
+#define safe_estrndup(ptr, len) ((ptr)?(_strndup((ptr), (len))):(empty_string))
 
 #endif