From e795b8a7ae584b93907942314c4c57eaa8beb26e Mon Sep 17 00:00:00 2001
From: Dmitry Stogov <dmitry@zend.com>
Date: Thu, 3 Aug 2023 10:37:25 +0300
Subject: [PATCH] DynASM: Fix crash in dasm_encode() when some section is empty

Fixes GH #1041
---
 dynasm/dasm_arm.h   | 1 +
 dynasm/dasm_arm64.h | 1 +
 dynasm/dasm_mips.h  | 1 +
 dynasm/dasm_ppc.h   | 1 +
 dynasm/dasm_x86.h   | 1 +
 5 files changed, 5 insertions(+)

diff --git a/dynasm/dasm_arm.h b/dynasm/dasm_arm.h
index aa16014e..3396769e 100644
--- a/dynasm/dasm_arm.h
+++ b/dynasm/dasm_arm.h
@@ -141,6 +141,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   memset((void *)D->lglabels, 0, D->lgsize);
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
+    D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);
     D->sections[i].pos = DASM_SEC2POS(i);
     D->sections[i].ofs = 0;
   }
diff --git a/dynasm/dasm_arm64.h b/dynasm/dasm_arm64.h
index e04898f1..9e4157f8 100644
--- a/dynasm/dasm_arm64.h
+++ b/dynasm/dasm_arm64.h
@@ -143,6 +143,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   memset((void *)D->lglabels, 0, D->lgsize);
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
+    D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);
     D->sections[i].pos = DASM_SEC2POS(i);
     D->sections[i].ofs = 0;
   }
diff --git a/dynasm/dasm_mips.h b/dynasm/dasm_mips.h
index 495eaa0e..8cb79052 100644
--- a/dynasm/dasm_mips.h
+++ b/dynasm/dasm_mips.h
@@ -140,6 +140,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   memset((void *)D->lglabels, 0, D->lgsize);
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
+    D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);
     D->sections[i].pos = DASM_SEC2POS(i);
     D->sections[i].ofs = 0;
   }
diff --git a/dynasm/dasm_ppc.h b/dynasm/dasm_ppc.h
index 30b757e3..71cd389d 100644
--- a/dynasm/dasm_ppc.h
+++ b/dynasm/dasm_ppc.h
@@ -140,6 +140,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   memset((void *)D->lglabels, 0, D->lgsize);
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
+    D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);
     D->sections[i].pos = DASM_SEC2POS(i);
     D->sections[i].ofs = 0;
   }
diff --git a/dynasm/dasm_x86.h b/dynasm/dasm_x86.h
index 66a68ea5..f16b3760 100644
--- a/dynasm/dasm_x86.h
+++ b/dynasm/dasm_x86.h
@@ -139,6 +139,7 @@ void dasm_setup(Dst_DECL, const void *actionlist)
   memset((void *)D->lglabels, 0, D->lgsize);
   if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize);
   for (i = 0; i < D->maxsection; i++) {
+    D->sections[i].rbuf = D->sections[i].buf - DASM_SEC2POS(i);
     D->sections[i].pos = DASM_SEC2POS(i);
     D->sections[i].ofs = 0;
   }