[sr-dev] git:master:54a0aeee: core: fix a crash in cfg parser related to invalid syntax cases

[Henning Westerholt]

Module: kamailio
Branch: master
Commit: 54a0aeee9d30ee85045150d8ad5b75f7a4b71d15
URL: https://github.com/kamailio/kamailio/commit/54a0aeee9d30ee85045150d8ad5b75f7a4b71d15

Author: Henning Westerholt <hw at skalatan.de>
Committer: Henning Westerholt <hw at skalatan.de>
Date: 2020-03-05T11:22:21+01:00

core: fix a crash in cfg parser related to invalid syntax cases

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Modified: src/core/cfg.y

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Diff:  https://github.com/kamailio/kamailio/commit/54a0aeee9d30ee85045150d8ad5b75f7a4b71d15.diff
Patch: https://github.com/kamailio/kamailio/commit/54a0aeee9d30ee85045150d8ad5b75f7a4b71d15.patch

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diff --git a/src/core/cfg.y b/src/core/cfg.y
index 23ab69ee08..6319f8b5b4 100644
--- a/src/core/cfg.y
+++ b/src/core/cfg.y
@@ -2893,7 +2893,7 @@ rval_expr: rval						{ $$=$1;
 		| rval_expr rve_cmpop rval_expr %prec GT { $$=mk_rve2( $2, $1, $3);}
 		| rval_expr rve_equalop rval_expr %prec EQUAL_T {
 			/* comparing with $null => treat as defined or !defined */
-			if($3->op==RVE_RVAL_OP && $3->left.rval.type==RV_PVAR
+			if($3 != NULL && $3->op==RVE_RVAL_OP && $3->left.rval.type==RV_PVAR
 					&& $3->left.rval.v.pvs.type==PVT_NULL) {
 				if($2==RVE_DIFF_OP || $2==RVE_IDIFF_OP
 						|| $2==RVE_STRDIFF_OP) {