From 08c7881b814c546efc3996fd1decdf0877f7a779 Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Thu, 15 Jun 2017 11:52:02 +0100
Subject: [PATCH] Prevent invalid array accesses when disassembling a corrupt
 bfin binary.

	PR binutils/21586
	* bfin-dis.c (gregs): Clip index to prevent overflow.
	(regs): Likewise.
	(regs_lo): Likewise.
	(regs_hi): Likewise.

Upstream-Status: Backport
CVE: CVE-2017-9749
Signed-off-by: Armin Kuster <akuster@mvista.com>

---
 opcodes/ChangeLog  | 8 ++++++++
 opcodes/bfin-dis.c | 8 ++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

Index: git/opcodes/ChangeLog
===================================================================
--- git.orig/opcodes/ChangeLog
+++ git/opcodes/ChangeLog
@@ -1,3 +1,11 @@
+2017-06-15  Nick Clifton  <nickc@redhat.com>
+
+	PR binutils/21586
+	* bfin-dis.c (gregs): Clip index to prevent overflow.
+	(regs): Likewise.
+	(regs_lo): Likewise.
+	(regs_hi): Likewise.
+
 2017-06-14  Nick Clifton  <nickc@redhat.com>
 
        PR binutils/21576
Index: git/opcodes/bfin-dis.c
===================================================================
--- git.orig/opcodes/bfin-dis.c
+++ git/opcodes/bfin-dis.c
@@ -350,7 +350,7 @@ static const enum machine_registers deco
   REG_P0, REG_P1, REG_P2, REG_P3, REG_P4, REG_P5, REG_SP, REG_FP,
 };
 
-#define gregs(x, i) REGNAME (decode_gregs[((i) << 3) | (x)])
+#define gregs(x, i) REGNAME (decode_gregs[(((i) << 3) | (x)) & 15])
 
 /* [dregs pregs (iregs mregs) (bregs lregs)].  */
 static const enum machine_registers decode_regs[] =
@@ -361,7 +361,7 @@ static const enum machine_registers deco
   REG_B0, REG_B1, REG_B2, REG_B3, REG_L0, REG_L1, REG_L2, REG_L3,
 };
 
-#define regs(x, i) REGNAME (decode_regs[((i) << 3) | (x)])
+#define regs(x, i) REGNAME (decode_regs[(((i) << 3) | (x)) & 31])
 
 /* [dregs pregs (iregs mregs) (bregs lregs) Low Half].  */
 static const enum machine_registers decode_regs_lo[] =
@@ -372,7 +372,7 @@ static const enum machine_registers deco
   REG_BL0, REG_BL1, REG_BL2, REG_BL3, REG_LL0, REG_LL1, REG_LL2, REG_LL3,
 };
 
-#define regs_lo(x, i) REGNAME (decode_regs_lo[((i) << 3) | (x)])
+#define regs_lo(x, i) REGNAME (decode_regs_lo[(((i) << 3) | (x)) & 31])
 
 /* [dregs pregs (iregs mregs) (bregs lregs) High Half].  */
 static const enum machine_registers decode_regs_hi[] =
@@ -383,7 +383,7 @@ static const enum machine_registers deco
   REG_BH0, REG_BH1, REG_BH2, REG_BH3, REG_LH0, REG_LH1, REG_LH2, REG_LH3,
 };
 
-#define regs_hi(x, i) REGNAME (decode_regs_hi[((i) << 3) | (x)])
+#define regs_hi(x, i) REGNAME (decode_regs_hi[(((i) << 3) | (x)) & 31])
 
 static const enum machine_registers decode_statbits[] =
 {
