From 5cf6ab0cf42a10f04d5c234bc6c70eb64dd207c8 Mon Sep 17 00:00:00 2001
From: purplerain <purplerain@secbsd.org>
Date: Thu, 7 Mar 2024 06:43:52 +0000
Subject: [PATCH] Fix off-by-one in dlist allocation when checking whether to
 allocate a new block. This fixes segfaults in dlist functions that occur on
 applications making heavy use of display lists that exceed BLOCK_SIZE.

---
 lib/mesa/src/mesa/main/dlist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mesa/src/mesa/main/dlist.c b/lib/mesa/src/mesa/main/dlist.c
index 63feef2b..8c32ed80 100644
--- a/lib/mesa/src/mesa/main/dlist.c
+++ b/lib/mesa/src/mesa/main/dlist.c
@@ -1220,7 +1220,7 @@ dlist_alloc(struct gl_context *ctx, OpCode opcode, GLuint bytes, bool align8)
       ctx->ListState.CurrentPos++;
    }
 
-   if (ctx->ListState.CurrentPos + numNodes + contNodes > BLOCK_SIZE) {
+   if (ctx->ListState.CurrentPos + numNodes + contNodes >= BLOCK_SIZE) {
       /* This block is full.  Allocate a new block and chain to it */
       Node *newblock;
       Node *n = ctx->ListState.CurrentBlock + ctx->ListState.CurrentPos;