Don't segfault or assert on NULL tls_sec

Real code won't hit these, but it's possible to contrive a testcase..

	* elf32-ppc.c (ppc_elf_relocate_section): Don't segfault on NULL
	tls_sec.
	* elf64-ppc.c (ppc64_elf_relocate_section): Likewise.
	* elflink.c (elf_link_output_extsym): Don't assert on NULL tls_sec.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 434a403..21ce154 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,12 @@
 2015-02-09  Alan Modra  <amodra@gmail.com>
 
+       * elf32-ppc.c (ppc_elf_relocate_section): Don't segfault on NULL
+       tls_sec.
+       * elf64-ppc.c (ppc64_elf_relocate_section): Likewise.
+       * elflink.c (elf_link_output_extsym): Don't assert on NULL tls_sec.
+
+2015-02-09  Alan Modra  <amodra@gmail.com>
+
        * elflink.c: Whitespace, formatting fixes.
        (elf_link_input_bfd): Clarify comment.
        (elf_link_output_extsym): Exclude symbols in linker created

diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index 640ced9..8d8167a 100644 (file)
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -8221,7 +8221,12 @@ ppc_elf_relocate_section (bfd *output_bfd,
                          {
                            outrel.r_addend += relocation;
                            if (tls_ty & (TLS_GD | TLS_DTPREL | TLS_TPREL))
-                             outrel.r_addend -= htab->elf.tls_sec->vma;
+                             {
+                               if (htab->elf.tls_sec == NULL)
+                                 outrel.r_addend = 0;
+                               else
+                                 outrel.r_addend -= htab->elf.tls_sec->vma;
+                             }
                          }
                        loc = rsec->contents;
                        loc += (rsec->reloc_count++
@@ -8239,9 +8244,14 @@ ppc_elf_relocate_section (bfd *output_bfd,
                          value = 1;
                        else if (tls_ty != 0)
                          {
-                           value -= htab->elf.tls_sec->vma + DTP_OFFSET;
-                           if (tls_ty == (TLS_TLS | TLS_TPREL))
-                             value += DTP_OFFSET - TP_OFFSET;
+                           if (htab->elf.tls_sec == NULL)
+                             value = 0;
+                           else
+                             {
+                               value -= htab->elf.tls_sec->vma + DTP_OFFSET;
+                               if (tls_ty == (TLS_TLS | TLS_TPREL))
+                                 value += DTP_OFFSET - TP_OFFSET;
+                             }
 
                            if (tls_ty == (TLS_TLS | TLS_GD))
                              {
@@ -8327,7 +8337,8 @@ ppc_elf_relocate_section (bfd *output_bfd,
        case R_PPC_DTPREL16_LO:
        case R_PPC_DTPREL16_HI:
        case R_PPC_DTPREL16_HA:
-         addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
          break;
 
          /* Relocations that may need to be propagated if this is a shared
@@ -8351,18 +8362,21 @@ ppc_elf_relocate_section (bfd *output_bfd,
                bfd_put_32 (output_bfd, insn, p);
              break;
            }
-         addend -= htab->elf.tls_sec->vma + TP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + TP_OFFSET;
          /* The TPREL16 relocs shouldn't really be used in shared
             libs as they will result in DT_TEXTREL being set, but
             support them anyway.  */
          goto dodyn;
 
        case R_PPC_TPREL32:
-         addend -= htab->elf.tls_sec->vma + TP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + TP_OFFSET;
          goto dodyn;
 
        case R_PPC_DTPREL32:
-         addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
          goto dodyn;
 
        case R_PPC_DTPMOD32:

diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index d597fec..f821231 100644 (file)
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -14121,7 +14121,12 @@ ppc64_elf_relocate_section (bfd *output_bfd,
                      {
                        outrel.r_addend += relocation;
                        if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL))
-                         outrel.r_addend -= htab->elf.tls_sec->vma;
+                         {
+                           if (htab->elf.tls_sec == NULL)
+                             outrel.r_addend = 0;
+                           else
+                             outrel.r_addend -= htab->elf.tls_sec->vma;
+                         }
                      }
                    loc = relgot->contents;
                    loc += (relgot->reloc_count++
@@ -14138,9 +14143,14 @@ ppc64_elf_relocate_section (bfd *output_bfd,
                      relocation = 1;
                    else if (tls_type != 0)
                      {
-                       relocation -= htab->elf.tls_sec->vma + DTP_OFFSET;
-                       if (tls_type == (TLS_TLS | TLS_TPREL))
-                         relocation += DTP_OFFSET - TP_OFFSET;
+                       if (htab->elf.tls_sec == NULL)
+                         relocation = 0;
+                       else
+                         {
+                           relocation -= htab->elf.tls_sec->vma + DTP_OFFSET;
+                           if (tls_type == (TLS_TLS | TLS_TPREL))
+                             relocation += DTP_OFFSET - TP_OFFSET;
+                         }
 
                        if (tls_type == (TLS_TLS | TLS_GD))
                          {
@@ -14273,7 +14283,8 @@ ppc64_elf_relocate_section (bfd *output_bfd,
                bfd_put_32 (output_bfd, insn, p);
              break;
            }
-         addend -= htab->elf.tls_sec->vma + TP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + TP_OFFSET;
          if (info->shared)
            /* The TPREL16 relocs shouldn't really be used in shared
               libs as they will result in DT_TEXTREL being set, but
@@ -14293,7 +14304,8 @@ ppc64_elf_relocate_section (bfd *output_bfd,
        case R_PPC64_DTPREL16_HIGHERA:
        case R_PPC64_DTPREL16_HIGHEST:
        case R_PPC64_DTPREL16_HIGHESTA:
-         addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
          break;
 
        case R_PPC64_ADDR64_LOCAL:
@@ -14308,11 +14320,13 @@ ppc64_elf_relocate_section (bfd *output_bfd,
          goto dodyn;
 
        case R_PPC64_TPREL64:
-         addend -= htab->elf.tls_sec->vma + TP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + TP_OFFSET;
          goto dodyn;
 
        case R_PPC64_DTPREL64:
-         addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
+         if (htab->elf.tls_sec != NULL)
+           addend -= htab->elf.tls_sec->vma + DTP_OFFSET;
          /* Fall thru */
 
          /* Relocations that may need to be propagated if this is a

diff --git a/bfd/elflink.c b/bfd/elflink.c
index 409be0c..16d9f20 100644 (file)
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -9042,12 +9042,6 @@ elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
                    asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
                    if (tls_sec != NULL)
                      sym.st_value -= tls_sec->vma;
-                   else
-                     {
-                       /* The TLS section may have been garbage collected.  */
-                       BFD_ASSERT (flinfo->info->gc_sections
-                                   && !input_sec->gc_mark);
-                     }
                  }
              }
          }