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fix << on signed int warnings 

<< on a negative number is undefined behaviour in C, and will trigger
fuzzer warnings.
This commit is contained in:
John Cupitt 2019-08-02 05:35:18 +01:00
parent 0f1e278dd9
commit 834acad825
11 changed files with 86 additions and 16 deletions
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34
libvips/arithmetic/boolean.c
View File

@ -73,6 +73,7 @@
#include <stdlib.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "binary.h"
#include "unaryconst.h"
@ -140,6 +141,15 @@ vips_boolean_build( VipsObject *object )
g_assert_not_reached(); \
}
#define FNLOOP( TYPE, FN ) { \
TYPE * restrict left = (TYPE *) in[0]; \
TYPE * restrict right = (TYPE *) in[1]; \
int * restrict q = (int *) out; \
\
for( x = 0; x < sz; x++ ) \
q[x] = FN( left[x], right[x] ); \
}
static void
vips_boolean_buffer( VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width )
@ -163,8 +173,30 @@ vips_boolean_buffer( VipsArithmetic *arithmetic,
SWITCH( LOOP, FLOOP, ^ );
break;
/* Special case: we need to be able to use VIPS_LSHIFT_INT().
*/
case VIPS_OPERATION_BOOLEAN_LSHIFT:
SWITCH( LOOP, FLOOP, << );
switch( vips_image_get_format( im ) ) {
case VIPS_FORMAT_UCHAR:
LOOP( unsigned char, << ); break;
case VIPS_FORMAT_CHAR:
FNLOOP( signed char, VIPS_LSHIFT_INT ); break;
case VIPS_FORMAT_USHORT:
LOOP( unsigned short, << ); break;
case VIPS_FORMAT_SHORT:
FNLOOP( signed short, VIPS_LSHIFT_INT ); break;
case VIPS_FORMAT_UINT:
LOOP( unsigned int, << ); break;
case VIPS_FORMAT_INT:
FNLOOP( signed int, VIPS_LSHIFT_INT ); break;
case VIPS_FORMAT_FLOAT:
FLOOP( float, << ); break;
case VIPS_FORMAT_DOUBLE:
FLOOP( double, << ); break;
default:
g_assert_not_reached();
}
break;
case VIPS_OPERATION_BOOLEAN_RSHIFT:

5
libvips/colour/LabQ2Lab.c
View File

@ -55,6 +55,7 @@
#include <stdio.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pcolour.h"
@ -95,12 +96,12 @@ vips_LabQ2Lab_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
/* Build a.
*/
l = (p[1] << 3) | ((lsbs >> 3) & 0x7);
l = VIPS_LSHIFT_INT( p[1], 3) | ((lsbs >> 3) & 0x7);
q[1] = (float) l * 0.125;
/* And b.
*/
l = (p[2] << 3) | (lsbs & 0x7);
l = VIPS_LSHIFT_INT( p[2], 3) | (lsbs & 0x7);
q[2] = (float) l * 0.125;
p += 4;

33
libvips/conversion/cast.c
View File

@ -158,6 +158,18 @@ G_DEFINE_TYPE( VipsCast, vips_cast, VIPS_TYPE_CONVERSION );
q[x] = (p[x] << n) | (((p[x] & 1) << n) - (p[x] & 1)); \
}
#define SHIFT_LEFT_SIGNED( ITYPE, OTYPE ) { \
ITYPE * restrict p = (ITYPE *) in; \
OTYPE * restrict q = (OTYPE *) out; \
int n = ((int) sizeof( OTYPE ) << 3) - ((int) sizeof( ITYPE ) << 3); \
\
g_assert( sizeof( ITYPE ) < sizeof( OTYPE ) ); \
\
for( x = 0; x < sz; x++ ) \
q[x] = VIPS_LSHIFT_INT( p[x], n ) | \
(((p[x] & 1) << n) - (p[x] & 1)); \
}
/* Cast int types to an int type. We need to pass in the type of the
* intermediate value, either uint or int, or we'll have problems with uint
* sources turning -ve.
@ -188,6 +200,21 @@ G_DEFINE_TYPE( VipsCast, vips_cast, VIPS_TYPE_CONVERSION );
} \
}
/* Int to int handling for signed int types.
*/
#define INT_INT_SIGNED( ITYPE, OTYPE, TEMP, CAST ) { \
if( cast->shift && \
sizeof( ITYPE ) > sizeof( OTYPE ) ) { \
SHIFT_RIGHT( ITYPE, OTYPE ); \
} \
else if( cast->shift ) { \
SHIFT_LEFT_SIGNED( ITYPE, OTYPE ); \
} \
else { \
CAST_INT_INT( ITYPE, OTYPE, TEMP, CAST ); \
} \
}
/* Cast float types to an int type.
*/
#define CAST_FLOAT_INT( ITYPE, OTYPE, TEMP, CAST ) { \
@ -336,7 +363,7 @@ vips_cast_gen( VipsRegion *or, void *vseq, void *a, void *b, gboolean *stop )
case VIPS_FORMAT_CHAR:
BAND_SWITCH_INNER( signed char,
INT_INT,
INT_INT_SIGNED,
CAST_REAL_FLOAT,
CAST_REAL_COMPLEX );
break;
@ -350,7 +377,7 @@ vips_cast_gen( VipsRegion *or, void *vseq, void *a, void *b, gboolean *stop )
case VIPS_FORMAT_SHORT:
BAND_SWITCH_INNER( signed short,
INT_INT,
INT_INT_SIGNED,
CAST_REAL_FLOAT,
CAST_REAL_COMPLEX );
break;
@ -364,7 +391,7 @@ vips_cast_gen( VipsRegion *or, void *vseq, void *a, void *b, gboolean *stop )
case VIPS_FORMAT_INT:
BAND_SWITCH_INNER( signed int,
INT_INT,
INT_INT_SIGNED,
CAST_REAL_FLOAT,
CAST_REAL_COMPLEX );
break;

2
libvips/conversion/tilecache.c
View File

@ -418,7 +418,7 @@ vips_rect_hash( VipsRect *pos )
* X discrimination is more important than Y, since
* most tiles will have a similar Y.
*/
hash = pos->left ^ (pos->top << 16);
hash = pos->left ^ VIPS_LSHIFT_INT( pos->top, 16 );
return( hash );
}

3
libvips/convolution/convi.c
View File

@ -123,6 +123,7 @@
#include <limits.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pconvolution.h"
@ -979,7 +980,7 @@ vips_convi_intize( VipsConvi *convi, VipsImage *M )
if( convi->exp > 0 )
int_value = (int_sum + (1 << (convi->exp - 1))) >> convi->exp;
else
int_value = int_sum << convi->exp;
int_value = VIPS_LSHIFT_INT( int_sum, convi->exp );
int_value = VIPS_CLIP( 0, int_value, 255 );
if( VIPS_ABS( true_value - int_value ) > 2 ) {

4
libvips/foreign/ppm.c
View File

@ -406,7 +406,7 @@ read_1bit_binary( FILE *fp, VipsImage *out )
for( y = 0; y < out->Ysize; y++ ) {
for( x = 0; x < out->Xsize * out->Bands; x++ ) {
buf[x] = (bits & 128) ? 0 : 255;
bits <<= 1;
bits = VIPS_LSHIFT_INT( bits, 1 );
if( (x & 7) == 7 )
bits = fgetc( fp );
}
@ -667,7 +667,7 @@ write_ppm_line_binary_squash( Write *write, VipsPel *p )
bits = 0;
n_bits = 0;
for( x = 0; x < write->in->Xsize; x++ ) {
bits <<= 1;
bits = VIPS_LSHIFT_INT( bits, 1 );
n_bits += 1;
bits |= p[x] ? 0 : 1;

2
libvips/foreign/tiff2vips.c
View File

@ -1066,7 +1066,7 @@ rtiff_palette_line_bit( Rtiff *rtiff,
}
}
else
*q++ = i << (8 - bits_per_sample);
*q++ = VIPS_LSHIFT_INT( i, 8 - bits_per_sample );
}
}

2
libvips/foreign/vips2tiff.c
View File

@ -1245,7 +1245,7 @@ LabS2Lab16( VipsPel *q, VipsPel *p, int n )
for( x = 0; x < n; x++ ) {
/* TIFF uses unsigned 16 bit ... move zero, scale up L.
*/
q1[0] = (int) p1[0] << 1;
q1[0] = VIPS_LSHIFT_INT( (int) p1[0], 1 );
q1[1] = p1[1];
q1[2] = p1[2];

3
libvips/foreign/webp2vips.c
View File

@ -248,7 +248,8 @@ vips_image_paint_area( VipsImage *image, const VipsRect *r, const VipsPel *ink )
/* Rebuild RGBA, assuming little-endian.
*/
#define setRGBA( R, G, B, A ) (R | (G << 8) | (B << 16) | (A << 24))
#define setRGBA( R, G, B, A ) \
(R | (G << 8) | (B << 16) | ((guint32) A << 24))
/* OVER blend of two unpremultiplied RGBA guint32
*

8
libvips/include/vips/internal.h
View File

@ -39,6 +39,14 @@
extern "C" {
#endif /*__cplusplus*/
/* << on an int is undefined in C if the int is negative. Imagine a machine
* that uses 1s complement, for example.
*
* Fuzzers find and warn about this, so we must use this macro instead. Cast
* to uint, shift, and cast back.
*/
#define VIPS_LSHIFT_INT( I, N ) ((int) ((unsigned int) (I) << (N)))
/* What we store in the Meta hash table. We can't just use GHashTable's
* key/value pairs, since we need to iterate over meta in Meta_traverse order.
*

6
libvips/iofuncs/base64.c
View File

@ -143,7 +143,7 @@ read24( const unsigned char *in, int remaining )
bits = 0;
for( i = 0; i < 3; i++ ) {
bits <<= 8;
bits = VIPS_LSHIFT_INT( bits, 8 );
if( remaining > 0 ) {
bits |= in[i];
remaining -= 1;
@ -167,7 +167,7 @@ encode24( char *p, int bits, int remaining )
/* Take the top 6 bits of 24.
*/
p[i] = b64_list[(bits >> 18) & 63];
bits <<= 6;
bits = VIPS_LSHIFT_INT( bits, 6 );
remaining -= 6;
}
}
@ -281,7 +281,7 @@ vips__b64_decode( const char *buffer, size_t *data_length )
unsigned int val;
if( (val = b64_index[(int) buffer[i]]) != XX ) {
bits <<= 6;
bits = VIPS_LSHIFT_INT( bits, 6 );
bits |= val;
nbits += 6;