erec: Sanitize erec location indesc

erec_print() unconditionally dereferences erec->locations->indesc, so
make sure it is valid when either creating an erec or adding a location.

Signed-off-by: Phil Sutter <phil@nwl.cc>

diff --git a/src/erec.c b/src/erec.c
index c550a596b38c83a52eb410c166a27594e3737dff..5c3351a512464af3c7470098f7f072599a195afc 100644 (file)
--- a/src/erec.c
+++ b/src/erec.c
@@ -38,7 +38,8 @@ void erec_add_location(struct error_record *erec, const struct location *loc)
 {
        assert(erec->num_locations < EREC_LOCATIONS_MAX);
        erec->locations[erec->num_locations] = *loc;
-       erec->locations[erec->num_locations].indesc = loc->indesc;
+       erec->locations[erec->num_locations].indesc = loc->indesc ?
+                                                   : &internal_indesc;
        erec->num_locations++;
 }