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Issue 1179: [CVE-2007-4965] Integer overflow in imageop module. 

Also fixes rgbimg module (just before it is removed from 2.6).
This commit is contained in:
Guido van Rossum 2008-08-19 20:57:46 +00:00
parent 275e229ee2
commit 4df1b6d478
2 changed files with 73 additions and 12 deletions
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80
Modules/imageop.c
View File

@ -78,7 +78,7 @@ imageop_crop(PyObject *self, PyObject *args)
char *cp, *ncp;
short *nsp;
Py_Int32 *nlp;
int len, size, x, y, newx1, newx2, newy1, newy2;
int len, size, x, y, newx1, newx2, newy1, newy2, nlen;
int ix, iy, xstep, ystep;
PyObject *rv;
@ -90,13 +90,19 @@ imageop_crop(PyObject *self, PyObject *args)
PyErr_SetString(ImageopError, "Size should be 1, 2 or 4");
return 0;
}
if ( len != size*x*y ) {
if (( len != size*x*y ) ||
( size != ((len / x) / y) )) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
xstep = (newx1 < newx2)? 1 : -1;
ystep = (newy1 < newy2)? 1 : -1;
nlen = (abs(newx2-newx1)+1)*(abs(newy2-newy1)+1)*size;
if ( size != ((nlen / (abs(newx2-newx1)+1)) / (abs(newy2-newy1)+1)) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
rv = PyString_FromStringAndSize(NULL,
(abs(newx2-newx1)+1)*(abs(newy2-newy1)+1)*size);
if ( rv == 0 )
@ -132,7 +138,7 @@ imageop_scale(PyObject *self, PyObject *args)
char *cp, *ncp;
short *nsp;
Py_Int32 *nlp;
int len, size, x, y, newx, newy;
int len, size, x, y, newx, newy, nlen;
int ix, iy;
int oix, oiy;
PyObject *rv;
@ -145,12 +151,18 @@ imageop_scale(PyObject *self, PyObject *args)
PyErr_SetString(ImageopError, "Size should be 1, 2 or 4");
return 0;
}
if ( len != size*x*y ) {
if ( ( len != size*x*y ) ||
( size != ((len / x) / y) ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
nlen = newx*newy*size;
if ( size != ((nlen / newx) / newy) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
rv = PyString_FromStringAndSize(NULL, newx*newy*size);
rv = PyString_FromStringAndSize(NULL, nlen);
if ( rv == 0 )
return 0;
ncp = (char *)PyString_AsString(rv);
@ -190,7 +202,8 @@ imageop_tovideo(PyObject *self, PyObject *args)
PyErr_SetString(ImageopError, "Size should be 1 or 4");
return 0;
}
if ( maxx*maxy*width != len ) {
if ( ( maxx*maxy*width != len ) ||
( maxx != ((len / maxy) / width) ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
@ -240,7 +253,8 @@ imageop_grey2mono(PyObject *self, PyObject *args)
if ( !PyArg_ParseTuple(args, "s#iii", &cp, &len, &x, &y, &tres) )
return 0;
if ( x*y != len ) {
if ( ( x*y != len ) ||
( x != len / y ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
@ -281,7 +295,8 @@ imageop_grey2grey4(PyObject *self, PyObject *args)
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
return 0;
if ( x*y != len ) {
if ( ( x*y != len ) ||
( x != len / y ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
@ -320,7 +335,8 @@ imageop_grey2grey2(PyObject *self, PyObject *args)
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
return 0;
if ( x*y != len ) {
if ( ( x*y != len ) ||
( x != len / y ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
@ -358,7 +374,8 @@ imageop_dither2mono(PyObject *self, PyObject *args)
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
return 0;
if ( x*y != len ) {
if ( ( x*y != len ) ||
( x != len / y ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
@ -404,7 +421,8 @@ imageop_dither2grey2(PyObject *self, PyObject *args)
if ( !PyArg_ParseTuple(args, "s#ii", &cp, &len, &x, &y) )
return 0;
if ( x*y != len ) {
if ( ( x*y != len ) ||
( x != len / y ) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
@ -443,7 +461,11 @@ imageop_mono2grey(PyObject *self, PyObject *args)
if ( !PyArg_ParseTuple(args, "s#iiii", &cp, &len, &x, &y, &v0, &v1) )
return 0;
nlen = x*y;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( (nlen+7)/8 != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
@ -481,6 +503,10 @@ imageop_grey22grey(PyObject *self, PyObject *args)
return 0;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( (nlen+3)/4 != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
@ -517,6 +543,10 @@ imageop_grey42grey(PyObject *self, PyObject *args)
return 0;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( (nlen+1)/2 != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
@ -554,6 +584,10 @@ imageop_rgb2rgb8(PyObject *self, PyObject *args)
return 0;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( nlen*4 != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
@ -598,10 +632,19 @@ imageop_rgb82rgb(PyObject *self, PyObject *args)
return 0;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( nlen != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( nlen / x != y || nlen > INT_MAX / 4) {
PyErr_SetString(ImageopError, "Image is too large");
return 0;
}
rv = PyString_FromStringAndSize(NULL, nlen*4);
if ( rv == 0 )
@ -648,6 +691,10 @@ imageop_rgb2grey(PyObject *self, PyObject *args)
return 0;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( nlen*4 != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
@ -693,10 +740,19 @@ imageop_grey2rgb(PyObject *self, PyObject *args)
return 0;
nlen = x*y;
if ( x != (nlen / y) ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( nlen != len ) {
PyErr_SetString(ImageopError, "String has incorrect length");
return 0;
}
if ( nlen / x != y || nlen > INT_MAX / 4) {
PyErr_SetString(ImageopError, "Image is too large");
return 0;
}
rv = PyString_FromStringAndSize(NULL, nlen*4);
if ( rv == 0 )

5
Modules/rgbimgmodule.c
View File

@ -299,6 +299,11 @@ longimagedata(PyObject *self, PyObject *args)
xsize = image.xsize;
ysize = image.ysize;
zsize = image.zsize;
tablen = xsize * ysize * zsize * sizeof(Py_Int32);
if (xsize != (((tablen / ysize) / zsize) / sizeof(Py_Int32))) {
PyErr_NoMemory();
goto finally;
}
if (rle) {
tablen = ysize * zsize * sizeof(Py_Int32);
rlebuflen = (int) (1.05 * xsize +10);