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-rw-r--r--src/payload.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/payload.c b/src/payload.c
index 83742fb0..08578fd8 100644
--- a/src/payload.c
+++ b/src/payload.c
@@ -85,6 +85,7 @@ static void payload_expr_pctx_update(struct proto_ctx *ctx,
base = ctx->protocol[left->payload.base].desc;
desc = proto_find_upper(base, proto);
+ assert(left->payload.base + 1 <= PROTO_BASE_MAX);
proto_ctx_update(ctx, left->payload.base + 1, &expr->location, desc);
}