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>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/erec.c b/src/erec.c
index c550a596..5c3351a5 100644
--- 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++;
 }