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imgcodesc: fix code problems with integer overflow / address arithmetic / UB

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This commit is contained in:
Alexander Alekhin 2017-08-23 15:15:27 +03:00
parent b67c64e2c8
commit aacae20657
8 changed files with 50 additions and 37 deletions
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8
modules/imgcodecs/src/grfmt_bmp.cpp
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@ -193,7 +193,7 @@ bool BmpDecoder::readHeader()
bool BmpDecoder::readData( Mat& img )
{
uchar* data = img.ptr();
int step = (int)img.step;
int step = validateToInt(img.step);
bool color = img.channels() > 1;
uchar gray_palette[256] = {0};
bool result = false;
@ -206,7 +206,7 @@ bool BmpDecoder::readData( Mat& img )
if( m_origin == IPL_ORIGIN_BL )
{
data += (m_height - 1)*step;
data += (m_height - 1)*(size_t)step;
step = -step;
}
@ -530,7 +530,7 @@ bool BmpEncoder::write( const Mat& img, const std::vector<int>& )
int bitmapHeaderSize = 40;
int paletteSize = channels > 1 ? 0 : 1024;
int headerSize = 14 /* fileheader */ + bitmapHeaderSize + paletteSize;
int fileSize = fileStep*height + headerSize;
size_t fileSize = (size_t)fileStep*height + headerSize;
PaletteEntry palette[256];
if( m_buf )
@ -540,7 +540,7 @@ bool BmpEncoder::write( const Mat& img, const std::vector<int>& )
strm.putBytes( fmtSignBmp, (int)strlen(fmtSignBmp) );
// write file header
strm.putDWord( fileSize ); // file size
strm.putDWord( validateToInt(fileSize) ); // file size
strm.putDWord( 0 );
strm.putDWord( headerSize );

10
modules/imgcodecs/src/grfmt_exr.cpp
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@ -195,7 +195,7 @@ bool ExrDecoder::readData( Mat& img )
bool color = img.channels() > 1;
uchar* data = img.ptr();
int step = img.step;
size_t step = img.step;
bool justcopy = m_native_depth;
bool chromatorgb = false;
bool rgbtogray = false;
@ -203,8 +203,8 @@ bool ExrDecoder::readData( Mat& img )
FrameBuffer frame;
int xsample[3] = {1, 1, 1};
char *buffer;
int xstep;
int ystep;
size_t xstep = 0;
size_t ystep = 0;
xstep = m_native_depth ? 4 : 1;
@ -593,7 +593,7 @@ bool ExrEncoder::write( const Mat& img, const std::vector<int>& )
bool issigned = depth == CV_8S || depth == CV_16S || depth == CV_32S;
bool isfloat = depth == CV_32F || depth == CV_64F;
depth = CV_ELEM_SIZE1(depth)*8;
const int step = img.step;
const size_t step = img.step;
Header header( width, height );
Imf::PixelType type;
@ -623,7 +623,7 @@ bool ExrEncoder::write( const Mat& img, const std::vector<int>& )
FrameBuffer frame;
char *buffer;
int bufferstep;
size_t bufferstep;
int size;
if( type == FLOAT && depth == 32 )
{

2
modules/imgcodecs/src/grfmt_jpeg.cpp
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@ -396,7 +396,7 @@ int my_jpeg_load_dht (struct jpeg_decompress_struct *info, unsigned char *dht,
bool JpegDecoder::readData( Mat& img )
{
volatile bool result = false;
int step = (int)img.step;
size_t step = img.step;
bool color = img.channels() > 1;
if( m_state && m_width && m_height )

6
modules/imgcodecs/src/grfmt_jpeg2000.cpp
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@ -156,7 +156,7 @@ bool Jpeg2KDecoder::readData( Mat& img )
bool result = false;
int color = img.channels() > 1;
uchar* data = img.ptr();
int step = (int)img.step;
size_t step = img.step;
jas_stream_t* stream = (jas_stream_t*)m_stream;
jas_image_t* image = (jas_image_t*)m_image;
@ -252,9 +252,9 @@ bool Jpeg2KDecoder::readData( Mat& img )
if( !jas_image_readcmpt( image, cmptlut[i], 0, 0, xend / xstep, yend / ystep, buffer ))
{
if( img.depth() == CV_8U )
result = readComponent8u( data + i, buffer, step, cmptlut[i], maxval, offset, ncmpts );
result = readComponent8u( data + i, buffer, validateToInt(step), cmptlut[i], maxval, offset, ncmpts );
else
result = readComponent16u( ((unsigned short *)data) + i, buffer, step / 2, cmptlut[i], maxval, offset, ncmpts );
result = readComponent16u( ((unsigned short *)data) + i, buffer, validateToInt(step / 2), cmptlut[i], maxval, offset, ncmpts );
if( !result )
{
i = ncmpts;

2
modules/imgcodecs/src/grfmt_pam.cpp
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@ -479,7 +479,7 @@ bool PAMDecoder::readData( Mat& img )
{
uchar* data = img.ptr();
int target_channels = img.channels();
int imp_stride = (int)img.step;
size_t imp_stride = img.step;
int sample_depth = CV_ELEM_SIZE1(m_type);
int src_elems_per_row = m_width*m_channels;
int src_stride = src_elems_per_row*sample_depth;

6
modules/imgcodecs/src/grfmt_sunras.cpp
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@ -160,7 +160,7 @@ bool SunRasterDecoder::readData( Mat& img )
{
int color = img.channels() > 1;
uchar* data = img.ptr();
int step = (int)img.step;
size_t step = img.step;
uchar gray_palette[256] = {0};
bool result = false;
int src_pitch = ((m_width*m_bpp + 7)/8 + 1) & -2;
@ -308,11 +308,11 @@ bad_decoding_1bpp:
code = m_strm.getByte();
if( color )
data = FillUniColor( data, line_end, step, width3,
data = FillUniColor( data, line_end, validateToInt(step), width3,
y, m_height, len,
m_palette[code] );
else
data = FillUniGray( data, line_end, step, width3,
data = FillUniGray( data, line_end, validateToInt(step), width3,
y, m_height, len,
gray_palette[code] );
if( y >= m_height )

51
modules/imgcodecs/src/utils.cpp
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@ -42,6 +42,13 @@
#include "precomp.hpp"
#include "utils.hpp"
int validateToInt(size_t sz)
{
int valueInt = (int)sz;
CV_Assert((size_t)valueInt == sz);
return valueInt;
}
#define SCALE 14
#define cR (int)(0.299*(1 << SCALE) + 0.5)
#define cG (int)(0.587*(1 << SCALE) + 0.5)
@ -537,23 +544,25 @@ uchar* FillColorRow1( uchar* data, uchar* indices, int len, PaletteEntry* palett
{
uchar* end = data + len*3;
const PaletteEntry p0 = palette[0], p1 = palette[1];
while( (data += 24) < end )
{
int idx = *indices++;
*((PaletteEntry*)(data - 24)) = palette[(idx & 128) != 0];
*((PaletteEntry*)(data - 21)) = palette[(idx & 64) != 0];
*((PaletteEntry*)(data - 18)) = palette[(idx & 32) != 0];
*((PaletteEntry*)(data - 15)) = palette[(idx & 16) != 0];
*((PaletteEntry*)(data - 12)) = palette[(idx & 8) != 0];
*((PaletteEntry*)(data - 9)) = palette[(idx & 4) != 0];
*((PaletteEntry*)(data - 6)) = palette[(idx & 2) != 0];
*((PaletteEntry*)(data - 3)) = palette[(idx & 1) != 0];
*((PaletteEntry*)(data - 24)) = (idx & 128) ? p1 : p0;
*((PaletteEntry*)(data - 21)) = (idx & 64) ? p1 : p0;
*((PaletteEntry*)(data - 18)) = (idx & 32) ? p1 : p0;
*((PaletteEntry*)(data - 15)) = (idx & 16) ? p1 : p0;
*((PaletteEntry*)(data - 12)) = (idx & 8) ? p1 : p0;
*((PaletteEntry*)(data - 9)) = (idx & 4) ? p1 : p0;
*((PaletteEntry*)(data - 6)) = (idx & 2) ? p1 : p0;
*((PaletteEntry*)(data - 3)) = (idx & 1) ? p1 : p0;
}
int idx = indices[0] << 24;
int idx = indices[0];
for( data -= 24; data < end; data += 3, idx += idx )
{
PaletteEntry clr = palette[idx < 0];
const PaletteEntry clr = (idx & 128) ? p1 : p0;
WRITE_PIX( data, clr );
}
@ -565,23 +574,25 @@ uchar* FillGrayRow1( uchar* data, uchar* indices, int len, uchar* palette )
{
uchar* end = data + len;
const uchar p0 = palette[0], p1 = palette[1];
while( (data += 8) < end )
{
int idx = *indices++;
*((uchar*)(data - 8)) = palette[(idx & 128) != 0];
*((uchar*)(data - 7)) = palette[(idx & 64) != 0];
*((uchar*)(data - 6)) = palette[(idx & 32) != 0];
*((uchar*)(data - 5)) = palette[(idx & 16) != 0];
*((uchar*)(data - 4)) = palette[(idx & 8) != 0];
*((uchar*)(data - 3)) = palette[(idx & 4) != 0];
*((uchar*)(data - 2)) = palette[(idx & 2) != 0];
*((uchar*)(data - 1)) = palette[(idx & 1) != 0];
*((uchar*)(data - 8)) = (idx & 128) ? p1 : p0;
*((uchar*)(data - 7)) = (idx & 64) ? p1 : p0;
*((uchar*)(data - 6)) = (idx & 32) ? p1 : p0;
*((uchar*)(data - 5)) = (idx & 16) ? p1 : p0;
*((uchar*)(data - 4)) = (idx & 8) ? p1 : p0;
*((uchar*)(data - 3)) = (idx & 4) ? p1 : p0;
*((uchar*)(data - 2)) = (idx & 2) ? p1 : p0;
*((uchar*)(data - 1)) = (idx & 1) ? p1 : p0;
}
int idx = indices[0] << 24;
int idx = indices[0];
for( data -= 8; data < end; data++, idx += idx )
{
data[0] = palette[idx < 0];
data[0] = (idx & 128) ? p1 : p0;
}
return data;

2
modules/imgcodecs/src/utils.hpp
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@ -42,6 +42,8 @@
#ifndef _UTILS_H_
#define _UTILS_H_
int validateToInt(size_t step);
struct PaletteEntry
{
unsigned char b, g, r, a;