commit 08c7881b814c546efc3996fd1decdf0877f7a779
Author: Nick Clifton <nickc@redhat.com>
Date:   Thu Jun 15 11:52:02 2017 +0100

    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: Thiruvadi Rajaraman <trajaraman@mvista.com>

Index: git/opcodes/bfin-dis.c
===================================================================
--- git.orig/opcodes/bfin-dis.c	2017-09-21 13:53:52.667168259 +0530
+++ git/opcodes/bfin-dis.c	2017-09-21 13:54:00.603231339 +0530
@@ -350,7 +350,7 @@
   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 @@
   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 @@
   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 @@
   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[] =
 {
Index: git/opcodes/ChangeLog
===================================================================
--- git.orig/opcodes/ChangeLog	2017-09-21 13:54:00.543230862 +0530
+++ git/opcodes/ChangeLog	2017-09-21 14:06:03.772928105 +0530
@@ -1,5 +1,13 @@
 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.
+
+2017-06-15  Nick Clifton  <nickc@redhat.com>
+
 	PR binutils/21588
 	* rl78-decode.opc (OP_BUF_LEN): Define.
 	(GETBYTE): Check for the index exceeding OP_BUF_LEN.