check the return value of getgroups() for -1 (coverity issue #390)

diff --git a/ext/standard/filestat.c b/ext/standard/filestat.c
index 3ace3c755176951340eae378fddaf3bf603de771..60a3a53ccb15cf61285da4a4a617aa40be812464 100644 (file)
--- a/ext/standard/filestat.c
+++ b/ext/standard/filestat.c
@@ -877,7 +877,7 @@ PHPAPI void php_stat(const char *filename, php_stat_len filename_length, int typ
                        gid_t *gids;
 
                        groups = getgroups(0, NULL);
-                       if(groups) {
+                       if(groups > 0) {
                                gids=(gid_t *)safe_emalloc(groups, sizeof(gid_t), 0);
                                n=getgroups(groups, gids);
                                for(i=0;i<n;i++){