CRIS: fix PR ld/26589, a missing NULL check in fix for PR ld/22269

Not sure why there wasn't a NULL check in the ld/22269 patch
(e01c16a8) at the time, as there was one for the corresponding patch
to elf32-m68k.c (5056ba1d).

Incidentally, I had missed that in 2017, as a prerequisite for the
ld/22269 series, the check_relocs function finally were made "safe"!
(I.e. the number of references and symbol types are final, garbage
collection done, so port-specific accounting can be made sanely.)

Committed.

bfd:
	PR ld/26589
	* elf32-cris.c (cris_elf_check_relocs): Add missing NULL check
	on argument before calling UNDEFWEAK_NO_DYNAMIC_RELOC.

ld:
	PR ld/26589
	* testsuite/ld-elf/pr26589.d, testsuite/ld-elf/locref3.s: New test.

(cherry picked from commit 4a8f181d196f85ca153fe51ca6bb40942e0e1ed7)

5 files changed, 44 insertions, 1 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 5d0c57d..b1f6007 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,10 @@
+2020-09-15  Hans-Peter Nilsson  <hp@axis.com>
+
+	Backport from mainline:
+	PR ld/26589
+	* elf32-cris.c (cris_elf_check_relocs): Add missing NULL check
+	on argument before calling UNDEFWEAK_NO_DYNAMIC_RELOC.
+
 2020-09-10  Alan Modra  <amodra@gmail.com>
 
 	Apply from master
diff --git a/bfd/elf32-cris.c b/bfd/elf32-cris.c
index 4360b54..2c0db65 100644
--- a/bfd/elf32-cris.c
+++ b/bfd/elf32-cris.c
@@ -3358,7 +3358,7 @@ cris_elf_check_relocs (bfd *abfd,
 
 	  /* No need to do anything if we're not creating a shared object.  */
 	  if (! bfd_link_pic (info)
-	      || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
+	      || (h != NULL && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)))
 	    break;
 
 	  /* We may need to create a reloc section in the dynobj and made room
diff --git a/ld/ChangeLog b/ld/ChangeLog
index d02d150..d927be5 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+2020-09-15  Hans-Peter Nilsson  <hp@axis.com>
+
+	Backport from mainline:
+	PR ld/26589
+	* testsuite/ld-elf/pr26589.d, testsuite/ld-elf/locref3.s: New test.
+
 2020-09-10  Alan Modra  <amodra@gmail.com>
 
 	Apply from master
diff --git a/ld/testsuite/ld-cris/locref3.s b/ld/testsuite/ld-cris/locref3.s
new file mode 100644
index 0000000..7991097
--- /dev/null
+++ b/ld/testsuite/ld-cris/locref3.s
@@ -0,0 +1,14 @@
+; Test-case primarily from PR26589, which could have been locref3.d.
+; A local (like "static") function, with all ELF decorations.
+.text
+ .type	alocalfunc,@function
+ .p2align 1
+alocalfunc:
+	nop
+.Lfe1:
+	.size	alocalfunc,.Lfe1-alocalfunc
+
+; Random absolute reference to the address of alocalfunc, requiring a
+; runtime relocation in code that needs to be PIC/PIE.
+ .data
+ .dword alocalfunc
diff --git a/ld/testsuite/ld-cris/pr26589.d b/ld/testsuite/ld-cris/pr26589.d
new file mode 100644
index 0000000..aee3143
--- /dev/null
+++ b/ld/testsuite/ld-cris/pr26589.d
@@ -0,0 +1,16 @@
+#source: dso-1.s
+#source: locref3.s
+#as: --pic --no-underscore --em=criself
+#ld: --shared -m crislinux
+#readelf: --dyn-syms -r
+
+# Besides typical DSO stuff (libdso-1.d), we here have a data section
+# with an absolute reloc to a local symbol.  For the original
+# test-case, this happened for a destructor (.dtors).
+
+Relocation section '\.rela\.dyn' at offset 0x[0-9a-f]+ contains 1 entry:
+ Offset[ 	]+Info[ 	]+Type[ 	]+Sym\.Value  Sym\. Name \+ Addend
+[a-f0-9]+[ ]+0+c R_CRIS_RELATIVE[ ]+ [a-f0-9]+
+
+Symbol table '\.dynsym' contains 3 entries:
+#pass