From 7357f524beb54ce64c5669afa39e6c68a72cea9b Mon Sep 17 00:00:00 2001 From: naruse Date: Wed, 28 Mar 2018 09:26:06 +0000 Subject: [PATCH] pack.c: fix underflow * pack.c (pack_unpack_internal): get rid of underflow. https://hackerone.com/reports/298246 git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@62975 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- pack.c | 2 +- test/ruby/test_pack.rb | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/pack.c b/pack.c index 45b816a590..12f30cb6b0 100644 --- a/pack.c +++ b/pack.c @@ -1127,7 +1127,7 @@ pack_unpack_internal(VALUE str, VALUE fmt, int mode) else if (ISDIGIT(*p)) { errno = 0; len = STRTOUL(p, (char**)&p, 10); - if (errno) { + if (len < 0 || errno) { rb_raise(rb_eRangeError, "pack length too big"); } } diff --git a/test/ruby/test_pack.rb b/test/ruby/test_pack.rb index 62a7a54e8d..a872bf33c2 100644 --- a/test/ruby/test_pack.rb +++ b/test/ruby/test_pack.rb @@ -548,6 +548,9 @@ class TestPack < Test::Unit::TestCase assert_equal([1, 2], "\x01\x00\x00\x02".unpack("C@3C")) assert_equal([nil], "\x00".unpack("@1C")) # is it OK? assert_raise(ArgumentError) { "\x00".unpack("@2C") } + + pos = RbConfig::LIMITS["UINTPTR_MAX"] - 99 # -100 + assert_raise(RangeError) {"0123456789".unpack("@#{pos}C10")} end def test_pack_unpack_percent