From 1ecd7c92fbbd83d74a1e9f6b921eeb82e13585c1 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Tue, 29 Oct 2024 21:25:30 +0100
Subject: [PATCH] Don't segfault on missing line number data

Can be reproduced on the CLI but not from a script:

    # should throw "unsupported object class" TypeError
    $ qjs --std -e 'bjson.write(function(){})'
    /path/to/quickjs.c:6510:15: runtime error: applying zero offset to null pointer
---
 quickjs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/quickjs.c b/quickjs.c
index 62cf79911..40f1842f1 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -6507,6 +6507,8 @@ static int find_line_num(JSContext *ctx, JSFunctionBytecode *b,
 
     *col = 1;
     p = b->pc2line_buf;
+    if (!p)
+        goto fail;
     p_end = p + b->pc2line_len;
     pc = 0;
     line_num = b->line_num;