From: Alan Modra <amodra@gmail.com>
Date: Mon, 20 Jan 2020 02:01:58 +0000 (+1030)
Subject: ubsan: arm: out of bounds array access
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2bddb71a7421213dd9d8b8f2db133b43f5e1357e;p=binutils-gdb.git

ubsan: arm: out of bounds array access

 .inst 0x81bdfe9f

disassembles as
   0:	81bdfe9f 	ldaexdhi	pc, reg-names-std, [sp]

I'm quite sure "reg-names-std" isn't an ARM register.

	* arm-dis.c (print_insn_arm): Wrap 'T' value.
---

diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 1f717519270..04eaa863e7c 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,7 @@
+2020-01-20  Alan Modra  <amodra@gmail.com>
+
+	* arm-dis.c (print_insn_arm): Wrap 'T' value.
+
 2020-01-18  Nick Clifton  <nickc@redhat.com>
 
 	* configure: Regenerate.
diff --git a/opcodes/arm-dis.c b/opcodes/arm-dis.c
index c986b5897ed..be2a93253bb 100644
--- a/opcodes/arm-dis.c
+++ b/opcodes/arm-dis.c
@@ -10106,7 +10106,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info, long given)
 			  case 'T':
 			    /* We want register + 1 when decoding T.  */
 			    if (*c == 'T')
-			      ++value;
+			      value = (value + 1) & 0xf;
 
 			    if (c[1] == 'u')
 			      {