1 files changed, 6 insertions, 0 deletions
diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index 066139df29..27d91f8a6c 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -1074,9 +1074,15 @@ PHP_FUNCTION(posix_getgrnam)
 		RETURN_FALSE;
 	}
 	buf = emalloc(buflen);
+try_again:
 	g = &gbuf;
 
 	if (getgrnam_r(name, g, buf, buflen, &g) || g == NULL) {
+		if (errno == ERANGE) {
+			buflen *= 2;
+			buf = erealloc(buf, buflen);
+			goto try_again;
+		}
 		POSIX_G(last_error) = errno;
 		efree(buf);
 		RETURN_FALSE;