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jpgd.h: Backport security vulnerabilities fixes from Google Android 

Squashed version of https://github.com/richgel999/jpeg-compressor/pull/10
with the line endings fixed (DOS to Unix).

See https://github.com/richgel999/jpeg-compressor/pull/10 and #30952
for details. Relates to CVE-2017-0700.

Fixes #30952.
This commit is contained in:
Rémi Verschelde 2019-07-30 12:32:57 +02:00
parent 7d76f3b393
commit 5c333270ed
1 changed files with 44 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
thirdparty/jpeg-compressor/jpgd.cpp vendored
View File

@ -29,6 +29,10 @@
#define JPGD_MAX(a,b) (((a)>(b)) ? (a) : (b))
#define JPGD_MIN(a,b) (((a)<(b)) ? (a) : (b))
// TODO: Move to header and use these constants when declaring the arrays.
#define JPGD_HUFF_TREE_MAX_LENGTH 512
#define JPGD_HUFF_CODE_SIZE_MAX_LENGTH 256
namespace jpgd {
static inline void *jpgd_malloc(size_t nSize) { return malloc(nSize); }
@ -491,8 +495,9 @@ inline uint jpeg_decoder::get_bits_no_markers(int num_bits)
// Decodes a Huffman encoded symbol.
inline int jpeg_decoder::huff_decode(huff_tables *pH)
{
int symbol;
JPGD_ASSERT(pH);
int symbol;
// Check first 8-bits: do we have a complete symbol?
if ((symbol = pH->look_up[m_bit_buf >> 24]) < 0)
{
@ -500,14 +505,19 @@ inline int jpeg_decoder::huff_decode(huff_tables *pH)
int ofs = 23;
do
{
symbol = pH->tree[-(int)(symbol + ((m_bit_buf >> ofs) & 1))];
unsigned int idx = -(int)(symbol + ((m_bit_buf >> ofs) & 1));
JPGD_ASSERT(idx < JPGD_HUFF_TREE_MAX_LENGTH);
symbol = pH->tree[idx];
ofs--;
} while (symbol < 0);
get_bits_no_markers(8 + (23 - ofs));
}
else
{
JPGD_ASSERT(symbol < JPGD_HUFF_CODE_SIZE_MAX_LENGTH);
get_bits_no_markers(pH->code_size[symbol]);
}
return symbol;
}
@ -517,6 +527,8 @@ inline int jpeg_decoder::huff_decode(huff_tables *pH, int& extra_bits)
{
int symbol;
JPGD_ASSERT(pH);
// Check first 8-bits: do we have a complete symbol?
if ((symbol = pH->look_up2[m_bit_buf >> 24]) < 0)
{
@ -524,7 +536,9 @@ inline int jpeg_decoder::huff_decode(huff_tables *pH, int& extra_bits)
int ofs = 23;
do
{
symbol = pH->tree[-(int)(symbol + ((m_bit_buf >> ofs) & 1))];
unsigned int idx = -(int)(symbol + ((m_bit_buf >> ofs) & 1));
JPGD_ASSERT(idx < JPGD_HUFF_TREE_MAX_LENGTH);
symbol = pH->tree[idx];
ofs--;
} while (symbol < 0);
@ -1495,6 +1509,12 @@ void jpeg_decoder::fix_in_buffer()
void jpeg_decoder::transform_mcu(int mcu_row)
{
jpgd_block_t* pSrc_ptr = m_pMCU_coefficients;
if (m_freq_domain_chroma_upsample) {
JPGD_ASSERT(mcu_row * m_blocks_per_mcu < m_expanded_blocks_per_row);
}
else {
JPGD_ASSERT(mcu_row * m_blocks_per_mcu < m_max_blocks_per_row);
}
uint8* pDst_ptr = m_pSample_buf + mcu_row * m_blocks_per_mcu * 64;
for (int mcu_block = 0; mcu_block < m_blocks_per_mcu; mcu_block++)
@ -1650,6 +1670,7 @@ void jpeg_decoder::load_next_row()
for (mcu_block = 0; mcu_block < m_blocks_per_mcu; mcu_block++)
{
component_id = m_mcu_org[mcu_block];
JPGD_ASSERT(m_comp_quant[component_id] < JPGD_MAX_QUANT_TABLES);
q = m_quant[m_comp_quant[component_id]];
p = m_pMCU_coefficients + 64 * mcu_block;
@ -1770,6 +1791,7 @@ void jpeg_decoder::decode_next_row()
for (int mcu_block = 0; mcu_block < m_blocks_per_mcu; mcu_block++, p += 64)
{
int component_id = m_mcu_org[mcu_block];
JPGD_ASSERT(m_comp_quant[component_id] < JPGD_MAX_QUANT_TABLES);
jpgd_quant_t* q = m_quant[m_comp_quant[component_id]];
int r, s;
@ -2229,8 +2251,11 @@ void jpeg_decoder::make_huff_table(int index, huff_tables *pH)
for (l = 1; l <= 16; l++)
{
for (i = 1; i <= m_huff_num[index][l]; i++)
{
JPGD_ASSERT(p < 257);
huffsize[p++] = static_cast<uint8>(l);
}
}
huffsize[p] = 0;
@ -2244,6 +2269,7 @@ void jpeg_decoder::make_huff_table(int index, huff_tables *pH)
{
while (huffsize[p] == si)
{
JPGD_ASSERT(p < 257);
huffcode[p++] = code;
code++;
}
@ -2275,7 +2301,8 @@ void jpeg_decoder::make_huff_table(int index, huff_tables *pH)
for (l = 1 << (8 - code_size); l > 0; l--)
{
JPGD_ASSERT(i < 256);
JPGD_ASSERT(i < JPGD_HUFF_CODE_SIZE_MAX_LENGTH);
JPGD_ASSERT(code < JPGD_HUFF_CODE_SIZE_MAX_LENGTH);
pH->look_up[code] = i;
@ -2325,16 +2352,19 @@ void jpeg_decoder::make_huff_table(int index, huff_tables *pH)
if ((code & 0x8000) == 0)
currententry--;
if (pH->tree[-currententry - 1] == 0)
unsigned int idx = -currententry - 1;
JPGD_ASSERT(idx < JPGD_HUFF_TREE_MAX_LENGTH);
if (pH->tree[idx] == 0)
{
pH->tree[-currententry - 1] = nextfreeentry;
pH->tree[idx] = nextfreeentry;
currententry = nextfreeentry;
nextfreeentry -= 2;
}
else
currententry = pH->tree[-currententry - 1];
else {
currententry = pH->tree[idx];
}
code <<= 1;
}
@ -2636,7 +2666,9 @@ void jpeg_decoder::decode_block_ac_first(jpeg_decoder *pD, int component_id, int
for (k = pD->m_spectral_start; k <= pD->m_spectral_end; k++)
{
s = pD->huff_decode(pD->m_pHuff_tabs[pD->m_comp_ac_tab[component_id]]);
unsigned int idx = pD->m_comp_ac_tab[component_id];
JPGD_ASSERT(idx < JPGD_MAX_HUFF_TABLES);
s = pD->huff_decode(pD->m_pHuff_tabs[idx]);
r = s >> 4;
s &= 15;
@ -2679,7 +2711,6 @@ void jpeg_decoder::decode_block_ac_refine(jpeg_decoder *pD, int component_id, in
int p1 = 1 << pD->m_successive_low;
int m1 = (-1) << pD->m_successive_low;
jpgd_block_t *p = pD->coeff_buf_getp(pD->m_ac_coeffs[component_id], block_x, block_y);
JPGD_ASSERT(pD->m_spectral_end <= 63);
k = pD->m_spectral_start;
@ -2688,7 +2719,9 @@ void jpeg_decoder::decode_block_ac_refine(jpeg_decoder *pD, int component_id, in
{
for ( ; k <= pD->m_spectral_end; k++)
{
s = pD->huff_decode(pD->m_pHuff_tabs[pD->m_comp_ac_tab[component_id]]);
unsigned int idx = pD->m_comp_ac_tab[component_id];
JPGD_ASSERT(idx < JPGD_MAX_HUFF_TABLES);
s = pD->huff_decode(pD->m_pHuff_tabs[idx]);
r = s >> 4;
s &= 15;