[binutils-gdb] Fix uninitialised variable errors

[binutils-gdb] Fix uninitialised variable errors

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=9fd82d9142d742c9e3efb16466019bd5fe86aef9

commit 9fd82d9142d742c9e3efb16466019bd5fe86aef9
Author: Alan Modra <amodra@gmail.com>
Date:   Thu Apr 4 11:23:32 2024 +1030

    Fix uninitialised variable errors
    
    Commit c6291d749aec introduced a number of errors, found by clang.
    
    elf.c:456:7: error: variable 'alloc_ext_size' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
      if (_bfd_mul_overflow (symcount, extsym_size, &amt))
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    elf.c:464:7: error: variable 'alloc_extshndx_size' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
      if (bfd_seek (ibfd, pos, SEEK_SET) != 0
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    elflink.c:2837:11: error: variable 'alloc1_size' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
          if (internal_relocs == NULL)
              ^~~~~~~~~~~~~~~~~~~~~~~
    elflink.c:12595:16: error: variable 'ext_size' set but not used [-Werror,-Wunused-but-set-variable]
                          size_t ext_size = 0;
    
            * elf.c (bfd_elf_get_elf_syms): Fix use of uninitialised variables.
            * elflink.c (_bfd_elf_link_info_read_relocs): Likewise.
            (bfd_elf_final_link): Fix set but not used warning.

Diff:
---
 bfd/elf.c     | 20 ++++++++++----------
 bfd/elflink.c |  4 ++--
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/bfd/elf.c b/bfd/elf.c
index 9b98d3b8b2b..c305b40eca3 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -456,8 +456,7 @@ bfd_elf_get_elf_syms (bfd *ibfd,
   if (_bfd_mul_overflow (symcount, extsym_size, &amt))
     {
       bfd_set_error (bfd_error_file_too_big);
-      intsym_buf = NULL;
-      goto out;
+      return NULL;
     }
   pos = symtab_hdr->sh_offset + symoffset * extsym_size;
   size_t alloc_ext_size = amt;
@@ -466,7 +465,7 @@ bfd_elf_get_elf_syms (bfd *ibfd,
 				    &alloc_ext, ibfd, false))
     {
       intsym_buf = NULL;
-      goto out;
+      goto out2;
     }
 
   size_t alloc_extshndx_size = 0;
@@ -478,7 +477,7 @@ bfd_elf_get_elf_syms (bfd *ibfd,
 	{
 	  bfd_set_error (bfd_error_file_too_big);
 	  intsym_buf = NULL;
-	  goto out;
+	  goto out1;
 	}
       alloc_extshndx_size = amt;
       pos = shndx_hdr->sh_offset + symoffset * sizeof (Elf_External_Sym_Shndx);
@@ -489,7 +488,7 @@ bfd_elf_get_elf_syms (bfd *ibfd,
 					ibfd, false))
 	{
 	  intsym_buf = NULL;
-	  goto out;
+	  goto out1;
 	}
     }
 
@@ -498,12 +497,12 @@ bfd_elf_get_elf_syms (bfd *ibfd,
       if (_bfd_mul_overflow (symcount, sizeof (Elf_Internal_Sym), &amt))
 	{
 	  bfd_set_error (bfd_error_file_too_big);
-	  goto out;
+	  goto out1;
 	}
       alloc_intsym = (Elf_Internal_Sym *) bfd_malloc (amt);
       intsym_buf = alloc_intsym;
       if (intsym_buf == NULL)
-	goto out;
+	goto out1;
     }
 
   /* Convert the symbols to internal form.  */
@@ -521,12 +520,13 @@ bfd_elf_get_elf_syms (bfd *ibfd,
 			    ibfd, (unsigned long) symoffset);
 	free (alloc_intsym);
 	intsym_buf = NULL;
-	goto out;
+	goto out1;
       }
 
- out:
-  _bfd_munmap_readonly_temporary (alloc_ext, alloc_ext_size);
+ out1:
   _bfd_munmap_readonly_temporary (alloc_extshndx, alloc_extshndx_size);
+ out2:
+  _bfd_munmap_readonly_temporary (alloc_ext, alloc_ext_size);
 
   return intsym_buf;
 }
diff --git a/bfd/elflink.c b/bfd/elflink.c
index 2a05299b24d..dd7ae1705b6 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -2835,7 +2835,7 @@ _bfd_elf_link_info_read_relocs (bfd *abfd,
       else
 	internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
       if (internal_relocs == NULL)
-	goto error_return;
+	return NULL;
     }
 
   alloc1 = external_relocs;
@@ -12592,6 +12592,7 @@ bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
 
 		  if ((sec->flags & SEC_RELOC) != 0)
 		    {
+#ifndef USE_MMAP
 		      size_t ext_size = 0;
 
 		      if (esdi->rel.hdr != NULL)
@@ -12599,7 +12600,6 @@ bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
 		      if (esdi->rela.hdr != NULL)
 			ext_size += esdi->rela.hdr->sh_size;
 
-#ifndef USE_MMAP
 		      if (ext_size > max_external_reloc_size)
 			max_external_reloc_size = ext_size;
 #endif