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 1f717519270ea1c74e8e3b9fc6b5405e05a2aae8..04eaa863e7c91f56cb0fa96032104d1d8c589102 100644 (file)
--- 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 c986b5897edaaf4d35ad3f7004d18409ba4aee10..be2a93253bb5673579780f2053161e281e64cb04 100644 (file)
--- 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')
                              {