From: Alan Modra <amodra@gmail.com>
Date: Thu, 27 Aug 2020 03:55:31 +0000 (+0930)
Subject: PR26462 UBSAN: reloc.c:473 shift exponent 4294967295
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cd570d497efca7b71ca999cb80d24bfcea5181ac;p=binutils-gdb.git

PR26462 UBSAN: reloc.c:473 shift exponent 4294967295

	PR 26462
	* reloc.c (bfd_check_overflow): Return early if zero bitsize.
---

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 18ded261a57..6d3ba691da9 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,8 @@
+2020-08-27  Alan Modra  <amodra@gmail.com>
+
+	PR 26462
+	* reloc.c (bfd_check_overflow): Return early if zero bitsize.
+
 2020-08-27  Alan Modra  <amodra@gmail.com>
 
 	* elf32-arm.c (elf32_arm_final_link_relocate): Don't segfault
diff --git a/bfd/reloc.c b/bfd/reloc.c
index 9aba84ca81e..7d3479acef4 100644
--- a/bfd/reloc.c
+++ b/bfd/reloc.c
@@ -466,6 +466,9 @@ bfd_check_overflow (enum complain_overflow how,
   bfd_vma fieldmask, addrmask, signmask, ss, a;
   bfd_reloc_status_type flag = bfd_reloc_ok;
 
+  if (bitsize == 0)
+    return flag;
+
   /* Note: BITSIZE should always be <= ADDRSIZE, but in case it's not,
      we'll be permissive: extra bits in the field mask will
      automatically extend the address mask for purposes of the