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[type1] Revert to signed size for binary data. 

Recently introduced and reported as
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39838

* src/type1/t1load.c (read_binary_data): Reject negative size.
(parse_subrs, parse_charstrings): Use customary signed size.
This commit is contained in:
Alexei Podtelezhnikov 2021-10-11 22:25:14 -04:00
parent 77bd46e959
commit 1029eb9377
1 changed files with 11 additions and 11 deletions
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22
src/type1/t1load.c
View File

@ -1336,7 +1336,7 @@
static int
read_binary_data( T1_Parser parser,
FT_ULong* size,
FT_Long* size,
FT_Byte** base,
FT_Bool incremental )
{
@ -1356,7 +1356,7 @@
if ( cur < limit && ft_isdigit( *cur ) )
{
FT_ULong s = (FT_ULong)T1_ToInt( parser );
FT_Long s = T1_ToInt( parser );
T1_Skip_PS_Token( parser ); /* `RD' or `-|' or something else */
@ -1365,7 +1365,7 @@
/* `RD' or `-|' token */
*base = parser->root.cursor + 1;
if ( s < (FT_ULong)( limit - *base ) )
if ( s >= 0 && s < limit - *base )
{
parser->root.cursor += s + 1;
*size = s;
@ -1793,7 +1793,7 @@
for ( count = 0; ; count++ )
{
FT_Long idx;
FT_ULong size;
FT_Long size;
FT_Byte* base;
@ -1851,7 +1851,7 @@
/* some fonts define empty subr records -- this is not totally */
/* compliant to the specification (which says they should at */
/* least contain a `return'), but we support them anyway */
if ( size < (FT_ULong)face->type1.private_dict.lenIV )
if ( size < face->type1.private_dict.lenIV )
{
error = FT_THROW( Invalid_File_Format );
goto Fail;
@ -1862,7 +1862,7 @@
goto Fail;
FT_MEM_COPY( temp, base, size );
psaux->t1_decrypt( temp, size, 4330 );
size -= (FT_ULong)face->type1.private_dict.lenIV;
size -= face->type1.private_dict.lenIV;
error = T1_Add_Table( table, (FT_Int)idx,
temp + face->type1.private_dict.lenIV, size );
FT_FREE( temp );
@ -1967,7 +1967,7 @@
for (;;)
{
FT_ULong size;
FT_Long size;
FT_Byte* base;
@ -2061,7 +2061,7 @@
FT_Byte* temp = NULL;
if ( size <= (FT_ULong)face->type1.private_dict.lenIV )
if ( size <= face->type1.private_dict.lenIV )
{
error = FT_THROW( Invalid_File_Format );
goto Fail;
@ -2072,7 +2072,7 @@
goto Fail;
FT_MEM_COPY( temp, base, size );
psaux->t1_decrypt( temp, size, 4330 );
size -= (FT_ULong)face->type1.private_dict.lenIV;
size -= face->type1.private_dict.lenIV;
error = T1_Add_Table( code_table, n,
temp + face->type1.private_dict.lenIV, size );
FT_FREE( temp );
@ -2324,7 +2324,7 @@
else if ( *cur == 'R' && cur + 6 < limit && *(cur + 1) == 'D' &&
have_integer )
{
FT_ULong s;
FT_Long s;
FT_Byte* b;
@ -2337,7 +2337,7 @@
else if ( *cur == '-' && cur + 6 < limit && *(cur + 1) == '|' &&
have_integer )
{
FT_ULong s;
FT_Long s;
FT_Byte* b;