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fix the potential overflow in char refs

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This commit is contained in:
Lee Thomason
2024-12-04 18:07:15 -08:00
parent d418ac22f2
commit 494735de30
2 changed files with 45 additions and 14 deletions
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tinyxml2.cpp
+15 -13
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@@ -472,11 +472,12 @@ const char* XMLUtil::GetCharacterRef( const char* p, char* value, int* length )
// Presume an entity, and pull it out.
*length = 0;
static const uint32_t MAX_CODE_POINT = 0x10FFFF;
if ( *(p+1) == '#' && *(p+2) ) {
unsigned long ucs = 0;
TIXMLASSERT( sizeof( ucs ) >= 4 );
uint32_t ucs = 0;
ptrdiff_t delta = 0;
unsigned mult = 1;
uint32_t mult = 1;
static const char SEMICOLON = ';';
if ( *(p+2) == 'x' ) {
@@ -487,7 +488,6 @@ const char* XMLUtil::GetCharacterRef( const char* p, char* value, int* length )
}
q = strchr( q, SEMICOLON );
if ( !q ) {
return 0;
}
@@ -497,7 +497,7 @@ const char* XMLUtil::GetCharacterRef( const char* p, char* value, int* length )
--q;
while ( *q != 'x' ) {
unsigned int digit = 0;
uint32_t digit = 0;
if ( *q >= '0' && *q <= '9' ) {
digit = *q - '0';
@@ -512,11 +512,12 @@ const char* XMLUtil::GetCharacterRef( const char* p, char* value, int* length )
return 0;
}
TIXMLASSERT( digit < 16 );
TIXMLASSERT( digit == 0 || mult <= UINT_MAX / digit );
const unsigned int digitScaled = mult * digit;
TIXMLASSERT( ucs <= ULONG_MAX - digitScaled );
ucs += digitScaled;
TIXMLASSERT( mult <= UINT_MAX / 16 );
if (ucs > MAX_CODE_POINT) {
return 0;
}
mult *= 16;
--q;
}
@@ -540,22 +541,23 @@ const char* XMLUtil::GetCharacterRef( const char* p, char* value, int* length )
while ( *q != '#' ) {
if ( *q >= '0' && *q <= '9' ) {
const unsigned int digit = *q - '0';
const uint32_t digit = *q - '0';
TIXMLASSERT( digit < 10 );
TIXMLASSERT( digit == 0 || mult <= UINT_MAX / digit );
const unsigned int digitScaled = mult * digit;
TIXMLASSERT( ucs <= ULONG_MAX - digitScaled );
const uint32_t digitScaled = mult * digit;
ucs += digitScaled;
if (ucs > MAX_CODE_POINT) {
return 0;
}
}
else {
return 0;
}
TIXMLASSERT( mult <= UINT_MAX / 10 );
mult *= 10;
--q;
}
}
// convert the UCS to UTF-8
TIXMLASSERT(ucs <= MAX_CODE_POINT);
ConvertUTF32ToUTF8( ucs, value, length );
return p + delta + 1;
}