From b36c9d12d7960c06872d866c25a913eb45b957bc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Tue, 14 Dec 2010 15:08:49 +0100 Subject: Fix type-checking of variable used in zero-width bit syntax construction <> will always produce an empty binary, regardless of the type of A. The bug is in the run-time system. Fix it so that a non-numeric value for A will cause a badarg exception. Reported-by: Zvi --- erts/emulator/beam/erl_bits.c | 14 ++++++++------ erts/emulator/test/bs_construct_SUITE.erl | 21 ++++++++++++++++++--- lib/stdlib/test/erl_eval_SUITE.erl | 16 +++++++++++++--- 3 files changed, 39 insertions(+), 12 deletions(-) diff --git a/erts/emulator/beam/erl_bits.c b/erts/emulator/beam/erl_bits.c index 88d2c06246..6f8a7436d5 100644 --- a/erts/emulator/beam/erl_bits.c +++ b/erts/emulator/beam/erl_bits.c @@ -555,10 +555,11 @@ fmt_int(byte *buf, Uint sz, Eterm val, Uint size, Uint flags) { unsigned long offs; - ASSERT(size != 0); offs = BIT_OFFSET(size); if (is_small(val)) { Sint v = signed_val(val); + + ASSERT(size != 0); /* Tested by caller */ if (flags & BSF_LITTLE) { /* Little endian */ sz--; COPY_VAL(buf,1,v,sz); @@ -578,6 +579,9 @@ fmt_int(byte *buf, Uint sz, Eterm val, Uint size, Uint flags) ErtsDigit* dp = big_v(val); int n = MIN(sz,ds); + if (size == 0) { + return 0; + } if (flags & BSF_LITTLE) { sz -= n; /* pad with this amount */ if (sign) { @@ -729,15 +733,13 @@ erts_new_bs_put_integer(ERL_BITS_PROTO_3(Eterm arg, Uint num_bits, unsigned flag Uint b; byte *iptr; - if (num_bits == 0) { - return 1; - } - bit_offset = BIT_OFFSET(bin_offset); if (is_small(arg)) { Uint rbits = 8 - bit_offset; - if (bit_offset + num_bits <= 8) { + if (num_bits == 0) { + return 1; + } else if (bit_offset + num_bits <= 8) { /* * All bits are in the same byte. */ diff --git a/erts/emulator/test/bs_construct_SUITE.erl b/erts/emulator/test/bs_construct_SUITE.erl index 3d9b51d278..138a19a626 100644 --- a/erts/emulator/test/bs_construct_SUITE.erl +++ b/erts/emulator/test/bs_construct_SUITE.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1999-2009. All Rights Reserved. +%% Copyright Ericsson AB 1999-2010. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -27,7 +27,7 @@ mem_leak/1, coerce_to_float/1, bjorn/1, huge_float_field/1, huge_binary/1, system_limit/1, badarg/1, copy_writable_binary/1, kostis/1, dynamic/1, bs_add/1, - otp_7422/1]). + otp_7422/1, zero_width/1]). -include("test_server.hrl"). @@ -36,7 +36,7 @@ all(suite) -> not_used, in_guard, mem_leak, coerce_to_float, bjorn, huge_float_field, huge_binary, system_limit, badarg, copy_writable_binary, kostis, dynamic, bs_add, - otp_7422]. + otp_7422, zero_width]. big(1) -> 57285702734876389752897683. @@ -786,5 +786,20 @@ otp_7422_bin(N) when N < 512 -> end), otp_7422_bin(N+1); otp_7422_bin(_) -> ok. + +zero_width(Config) when is_list(Config) -> + ?line Z = id(0), + Small = id(42), + Big = id(1 bsl 128), + ?line <<>> = <>, + ?line <<>> = <>, + ?line <<>> = <>, + ?line <<>> = <>, + + ?line {'EXIT',{badarg,_}} = (catch <>), + ?line {'EXIT',{badarg,_}} = (catch <<(id(not_a_number)):Z>>), + ?line {'EXIT',{badarg,_}} = (catch <<(id(not_a_number)):0>>), + + ok. id(I) -> I. diff --git a/lib/stdlib/test/erl_eval_SUITE.erl b/lib/stdlib/test/erl_eval_SUITE.erl index c60a558fa1..254ce0095d 100644 --- a/lib/stdlib/test/erl_eval_SUITE.erl +++ b/lib/stdlib/test/erl_eval_SUITE.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1998-2009. All Rights Reserved. +%% Copyright Ericsson AB 1998-2010. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -38,7 +38,8 @@ otp_8133/1, funs/1, try_catch/1, - eval_expr_5/1]). + eval_expr_5/1, + zero_width/1]). %% %% Define to run outside of test server @@ -76,7 +77,8 @@ all(suite) -> [guard_1, guard_2, match_pattern, string_plusplus, pattern_expr, match_bin, guard_3, guard_4, lc, simple_cases, unary_plus, apply_atom, otp_5269, otp_6539, otp_6543, - otp_6787, otp_6977, otp_7550, otp_8133, funs, try_catch, eval_expr_5]. + otp_6787, otp_6977, otp_7550, otp_8133, funs, try_catch, eval_expr_5, + zero_width]. guard_1(doc) -> ["(OTP-2405)"]; @@ -1326,6 +1328,14 @@ eval_expr_5(Config) when is_list(Config) -> ok end. +zero_width(Config) when is_list(Config) -> + ?line check(fun() -> + {'EXIT',{badarg,_}} = (catch <>), + ok + end, "begin {'EXIT',{badarg,_}} = (catch <>), " + "ok end.", ok), + ok. + %% Check the string in different contexts: as is; in fun; from compiled code. check(F, String, Result) -> check1(F, String, Result), -- cgit v1.2.3