PR27271, c6x-uclinux-ld segfaults linking ld-uClibc-1.0.37.so

bfd/
	PR 27271
	* elflink.c (bfd_elf_link_record_dynamic_symbol): Don't segfault
	on symbols defined in absolute or other special sections.
ld/
	* testsuite/ld-tic6x/tic6x.exp: Add pr27271 test.

(cherry picked from commit c456678)

Author: amodra

bfd/ChangeLog

@@ -1,3 +1,9 @@
+2021-01-29  Alan Modra  <amodra@gmail.com>
+
+	PR 27271
+	* elflink.c (bfd_elf_link_record_dynamic_symbol): Don't segfault
+	on symbols defined in absolute or other special sections.
+
 2021-01-26  Alan Modra  <amodra@gmail.com>
 
 	* elf32-ft32.c (ft32_reloc_type_lookup): Don't miss ft32_reloc_map[0].

bfd/elflink.c

@@ -537,8 +537,10 @@ bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
 	      if (!elf_hash_table (info)->is_relocatable_executable
 		  || ((h->root.type == bfd_link_hash_defined
 		       || h->root.type == bfd_link_hash_defweak)
+		      && h->root.u.def.section->owner != NULL
 		      && h->root.u.def.section->owner->no_export)
 		  || (h->root.type == bfd_link_hash_common
+		      && h->root.u.c.p->section->owner != NULL
 		      && h->root.u.c.p->section->owner->no_export))
 		return TRUE;
 	    }

ld/ChangeLog

@@ -1,3 +1,7 @@
+2021-01-29  Alan Modra  <amodra@gmail.com>
+
+	* testsuite/ld-tic6x/tic6x.exp: Add pr27271 test.
+
 2021-01-27  Nick Clifton  <nickc@redhat.com>
 
 	Import from mainline:

ld/testsuite/ld-tic6x/tic6x.exp

@@ -130,6 +130,11 @@ set shlibtests {
       {objdump -sj.got static-app-1rb.sd}
       {objdump -R static-app-1rb.od}}
      "static-app-1rb"}
+
+    {"C6X shared library with --export-dynamic"
+     "-shared --export-dynamic -Tdsbt.ld --dsbt-size=3 --hash-style=sysv" ""
+     "-mdsbt -mpic -mpid=near" {shlib-1.s shlib-2.s}
+     {} "pr27271.so"}
 }
 
 run_ld_link_tests $shlibtests