From a5ade112cb3fc0597800a2eabf4a07e9fb7b7db8 Mon Sep 17 00:00:00 2001
From: bptato <60043228+bptato@users.noreply.github.com>
Date: Wed, 25 Jun 2025 23:21:56 +0200
Subject: [PATCH] Add missing error handling in getAppFilename (#25017)

readlink can return -1, e.g. if procfs isn't mounted in a Linux chroot.
(At least that's how I found this.)

(cherry picked from commit b6491e7de54f6880b59c46853cf51f8aee8b83e6)
---
 lib/pure/os.nim | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index ea8dd1483a..594295ac3d 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -565,6 +565,8 @@ when not weirdTarget and (defined(linux) or defined(solaris) or defined(bsd) or
     if len > maxSymlinkLen:
       result = newString(len+1)
       len = readlink(procPath, result.cstring, len)
+    if len < 0: # error in readlink
+      len = 0
     setLen(result, len)
 
 when not weirdTarget and defined(openbsd):