Handle NULL strings gracefully during constant registration

When libcurl is compiled not using e.g. libz or SSL, then a call to
curl_version_info could return NULL in the corresponding fields of
curl_version_info_data.

Passing such NULL pointers down to REGISTER_NS_STRING_CONSTANT results
in a segfault during php startup, so let's check for this special case
and register a NULL constant in this case.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

diff --git a/src/php_http_client_curl.c b/src/php_http_client_curl.c
index f286324d808cdb5e535a31668d2f4ed44c711e72..f07bb8f4abbcefa148b39b7a2d2a2b5ef718192f 100644 (file)
--- a/src/php_http_client_curl.c
+++ b/src/php_http_client_curl.c
@@ -2429,6 +2429,14 @@ php_http_client_ops_t *php_http_client_curl_get_ops(void)
        return &php_http_client_curl_ops;
 }
 
+#define REGISTER_NS_STRING_OR_NULL_CONSTANT(ns, name, str, flags)                              \
+               do {                                                                           \
+                       if ((str) != NULL) {                                                   \
+                               REGISTER_NS_STRING_CONSTANT(ns, name, str, flags);             \
+                       } else {                                                               \
+                               REGISTER_NS_NULL_CONSTANT(ns, name, flags);                    \
+                       }                                                                      \
+               } while (0)
 
 PHP_MINIT_FUNCTION(http_client_curl)
 {
@@ -2509,12 +2517,12 @@ PHP_MINIT_FUNCTION(http_client_curl)
                REGISTER_NS_STRING_CONSTANT("http\\Client\\Curl", "VERSIONS", curl_version(), CONST_CS|CONST_PERSISTENT);
 #if CURLVERSION_NOW >= 0
                REGISTER_NS_STRING_CONSTANT("http\\Client\\Curl\\Versions", "CURL", (char *) info->version, CONST_CS|CONST_PERSISTENT);
-               REGISTER_NS_STRING_CONSTANT("http\\Client\\Curl\\Versions", "SSL", (char *) info->ssl_version, CONST_CS|CONST_PERSISTENT);
-               REGISTER_NS_STRING_CONSTANT("http\\Client\\Curl\\Versions", "LIBZ", (char *) info->libz_version, CONST_CS|CONST_PERSISTENT);
+               REGISTER_NS_STRING_OR_NULL_CONSTANT("http\\Client\\Curl\\Versions", "SSL", (char *) info->ssl_version, CONST_CS|CONST_PERSISTENT);
+               REGISTER_NS_STRING_OR_NULL_CONSTANT("http\\Client\\Curl\\Versions", "LIBZ", (char *) info->libz_version, CONST_CS|CONST_PERSISTENT);
 # if CURLVERSION_NOW >= 1
-               REGISTER_NS_STRING_CONSTANT("http\\Client\\Curl\\Versions", "ARES", (char *) info->ares, CONST_CS|CONST_PERSISTENT);
+               REGISTER_NS_STRING_OR_NULL_CONSTANT("http\\Client\\Curl\\Versions", "ARES", (char *) info->ares, CONST_CS|CONST_PERSISTENT);
 #  if CURLVERSION_NOW >= 2
-               REGISTER_NS_STRING_CONSTANT("http\\Client\\Curl\\Versions", "IDN", (char *) info->libidn, CONST_CS|CONST_PERSISTENT);
+               REGISTER_NS_STRING_OR_NULL_CONSTANT("http\\Client\\Curl\\Versions", "IDN", (char *) info->libidn, CONST_CS|CONST_PERSISTENT);
 #  endif
 # endif
 #endif