From c52128c581c8b474733cc3ee035ffd0e964e661e Mon Sep 17 00:00:00 2001
From: Edmund Grimley Evans <Edmund.Grimley.Evans@gmail.com>
Date: Mon, 9 Nov 2015 22:57:58 +0000
Subject: [PATCH] tccelf.c: Avoid two trivial instances of undefined behaviour.

---
 tccelf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tccelf.c b/tccelf.c
index d2c4a90..60320be 100644
--- a/tccelf.c
+++ b/tccelf.c
@@ -812,7 +812,8 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
 	      {
                 tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed (val=%lx, addr=%lx)", addr, val);
 	      }
-            *(uint32_t *)ptr = 0x14000000 | (type == R_AARCH64_CALL26) << 31 |
+            *(uint32_t *)ptr = 0x14000000 |
+                (uint32_t)(type == R_AARCH64_CALL26) << 31 |
                 ((val - addr) >> 2 & 0x3ffffff);
             break;
         case R_AARCH64_ADR_GOT_PAGE: {
@@ -2435,7 +2436,8 @@ static void tcc_output_elf(TCCState *s1, FILE *f, int phnum, ElfW(Phdr) *phdr,
                 offset++;
             }
             size = s->sh_size;
-            fwrite(s->data, 1, size, f);
+            if (size)
+                fwrite(s->data, 1, size, f);
             offset += size;
         }
     }