From 3556c129601f84a3661c7db9de9c84360b97f45f Mon Sep 17 00:00:00 2001
From: TuxSH <1922548+TuxSH@users.noreply.github.com>
Date: Sun, 2 Feb 2020 19:17:30 +0000
Subject: [PATCH] thermosphere: gdb: fix IsThreadAlive

---
 thermosphere/src/gdb/thread.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/thermosphere/src/gdb/thread.c b/thermosphere/src/gdb/thread.c
index e962cb146..d7fa9a302 100644
--- a/thermosphere/src/gdb/thread.c
+++ b/thermosphere/src/gdb/thread.c
@@ -53,12 +53,12 @@ GDB_DECLARE_HANDLER(IsThreadAlive)
 {
     unsigned long threadId;
 
-    if (GDB_ParseHexIntegerList(&threadId, ctx->commandData, 1, 0) == NULL) {
+    if (GDB_ParseHexIntegerList(&threadId, ctx->commandData, 1, 0) == NULL || threadId < 1) {
         return GDB_ReplyErrno(ctx, EILSEQ);
     }
 
     u32 coreMask = ctx->attachedCoreList;
-    return (coreMask & BIT(threadId)) != 0 ? GDB_ReplyOk(ctx) : GDB_ReplyErrno(ctx, ESRCH);
+    return (coreMask & BIT(threadId - 1)) != 0 ? GDB_ReplyOk(ctx) : GDB_ReplyErrno(ctx, ESRCH);
 }
 
 GDB_DECLARE_QUERY_HANDLER(CurrentThreadId)