From cedfc77485dbb566619dc1e2d729ce0a70d1a4ad Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Mon, 16 Dec 2019 10:31:34 +1030 Subject: [PATCH] ubsan: bfin: left shift of negative value * bfin-dis.c (fmtconst, fmtconst_val): Avoid signed overflow. --- opcodes/ChangeLog | 4 ++++ opcodes/bfin-dis.c | 17 ++++++++--------- 2 files changed, 12 insertions(+), 9 deletions(-) diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index 65ef685d070..ca476060e93 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,3 +1,7 @@ +2019-12-16 Alan Modra + + * bfin-dis.c (fmtconst, fmtconst_val): Avoid signed overflow. + 2019-12-16 Alan Modra * nds32-dis.c (print_insn16, print_insn32): Remove forward decls. diff --git a/opcodes/bfin-dis.c b/opcodes/bfin-dis.c index 711f7e1e07a..19ce4260145 100644 --- a/opcodes/bfin-dis.c +++ b/opcodes/bfin-dis.c @@ -128,7 +128,8 @@ fmtconst (const_forms_t cf, TIword x, bfd_vma pc, disassemble_info *outf) if (constant_formats[cf].pcrel) x = SIGNEXTEND (x, constant_formats[cf].nbits); - ea = (x + constant_formats[cf].offset) << constant_formats[cf].scale; + ea = x + constant_formats[cf].offset; + ea = ea << constant_formats[cf].scale; if (constant_formats[cf].pcrel) ea += pc; @@ -152,17 +153,14 @@ fmtconst (const_forms_t cf, TIword x, bfd_vma pc, disassemble_info *outf) { int nb = constant_formats[cf].nbits + 1; - x = x | (1 << constant_formats[cf].nbits); + x = x | (1ul << constant_formats[cf].nbits); x = SIGNEXTEND (x, nb); } else if (constant_formats[cf].issigned) x = SIGNEXTEND (x, constant_formats[cf].nbits); - if (constant_formats[cf].offset) - x += constant_formats[cf].offset; - - if (constant_formats[cf].scale) - x <<= constant_formats[cf].scale; + x += constant_formats[cf].offset; + x = (unsigned long) x << constant_formats[cf].scale; if (constant_formats[cf].decimal) sprintf (buf, "%*li", constant_formats[cf].leading, x); @@ -186,7 +184,8 @@ fmtconst_val (const_forms_t cf, unsigned int x, unsigned int pc) if (constant_formats[cf].pcrel) x = SIGNEXTEND (x, constant_formats[cf].nbits); - ea = (x + constant_formats[cf].offset) << constant_formats[cf].scale; + ea = x + constant_formats[cf].offset; + ea = ea << constant_formats[cf].scale; if (constant_formats[cf].pcrel) ea += pc; @@ -197,7 +196,7 @@ fmtconst_val (const_forms_t cf, unsigned int x, unsigned int pc) if (constant_formats[cf].negative) { int nb = constant_formats[cf].nbits + 1; - x = x | (1u << constant_formats[cf].nbits); + x = x | (1ul << constant_formats[cf].nbits); x = SIGNEXTEND (x, nb); } else if (constant_formats[cf].issigned) -- 2.30.2