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[lex] Don't read past the end of the buffer 

While dereferencing ThisTokEnd is fine and we know that it's not in
[a-zA-Z0-9_.], ThisTokEnd[1] is really past the end.

Found by asan and with a little help from clang-fuzz.

llvm-svn: 233491
This commit is contained in:
Benjamin Kramer 2015-03-29 14:11:37 +00:00
parent 7fd88386b0
commit 8671028e95
2 changed files with 13 additions and 3 deletions
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7
clang/lib/Lex/LiteralSupport.cpp
View File

@ -748,11 +748,11 @@ void NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) {
s++; s++;
int c1 = s[0]; int c1 = s[0];
int c2 = s[1];
// Handle a hex number like 0x1234. // Handle a hex number like 0x1234.
if ((c1 == 'x' || c1 == 'X') && (isHexDigit(c2) || c2 == '.')) { if ((c1 == 'x' || c1 == 'X') && (isHexDigit(s[1]) || s[1] == '.')) {
s++; s++;
assert(s < ThisTokEnd && "didn't maximally munch?");
radix = 16; radix = 16;
DigitsBegin = s; DigitsBegin = s;
s = SkipHexDigits(s); s = SkipHexDigits(s);
@ -804,7 +804,7 @@ void NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) {
} }
// Handle simple binary numbers 0b01010 // Handle simple binary numbers 0b01010
if ((c1 == 'b' || c1 == 'B') && (c2 == '0' || c2 == '1')) { if ((c1 == 'b' || c1 == 'B') && (s[1] == '0' || s[1] == '1')) {
// 0b101010 is a C++1y / GCC extension. // 0b101010 is a C++1y / GCC extension.
PP.Diag(TokLoc, PP.Diag(TokLoc,
PP.getLangOpts().CPlusPlus14 PP.getLangOpts().CPlusPlus14
@ -813,6 +813,7 @@ void NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) {
? diag::ext_binary_literal_cxx14 ? diag::ext_binary_literal_cxx14
: diag::ext_binary_literal); : diag::ext_binary_literal);
++s; ++s;
assert(s < ThisTokEnd && "didn't maximally munch?");
radix = 2; radix = 2;
DigitsBegin = s; DigitsBegin = s;
s = SkipBinaryDigits(s); s = SkipBinaryDigits(s);

9
clang/test/Lexer/eof-number.c Normal file
View File

@ -0,0 +1,9 @@
// RUN: %clang_cc1 %s -verify -fsyntax-only -Wnewline-eof
// vim: set binary noeol:
// This file intentionally ends without a \n on the last line. Make sure your
// editor doesn't add one.
// expected-error@+2{{unterminated conditional directive}}
// expected-warning@+1{{no newline at end of file}}
#if 0