t7800: readlink may not be available

diff --git a/xdiff-interface.c b/xdiff-interface.c
index ecfa05f616f4b72d65bcb129c1ee2141cf3d1c47..cb67c1c42b35e412dccf9a13ad18dde727ab8ce6 100644 (file)
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -131,6 +131,9 @@ int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t co
        mmfile_t a = *mf1;
        mmfile_t b = *mf2;
 
+       if (mf1->size > MAX_XDIFF_SIZE || mf2->size > MAX_XDIFF_SIZE)
+               return -1;
+
        trim_common_tail(&a, &b, xecfg->ctxlen);
 
        return xdl_diff(&a, &b, xpp, xecfg, xecb);