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Improved checks in font_render #7218

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merged 5 commits into from Jun 18, 2023
Merged

Improved checks in font_render #7218

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618c00c
Return early if image is null
radarhere Jun 15, 2023
98cc2e6
Destroy image on error
radarhere Jun 15, 2023
7044038
Fixed decompression bomb check
radarhere Jun 17, 2023
fd9bea2
Compare long long with long long
radarhere Jun 17, 2023
eaf5c09
Merge branch 'main' into null
radarhere Jun 17, 2023
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Binary file added Tests/fonts/oom-4da0210eb7081b0bf15bf16cc4c52ce02c1e1bbc.ttf
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1 change: 1 addition & 0 deletions Tests/test_imagefont.py
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Expand Up @@ -1042,6 +1042,7 @@ def test_render_mono_size():
"test_file",
[
"Tests/fonts/oom-e8e927ba6c0d38274a37c1567560eb33baf74627.ttf",
"Tests/fonts/oom-4da0210eb7081b0bf15bf16cc4c52ce02c1e1bbc.ttf",
],
)
def test_oom(test_file):
Expand Down
24 changes: 19 additions & 5 deletions src/_imagingft.c
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Expand Up @@ -880,13 +880,17 @@
width += stroke_width * 2 + ceil(x_start);
height += stroke_width * 2 + ceil(y_start);
if (max_image_pixels != Py_None) {
if (width * height > PyLong_AsLong(max_image_pixels) * 2) {
if ((long long)width * height > PyLong_AsLongLong(max_image_pixels) * 2) {
PyMem_Del(glyph_info);
return Py_BuildValue("O(ii)(ii)", Py_None, width, height, 0, 0);
}
}

image = PyObject_CallFunction(fill, "s(ii)", strcmp(mode, "RGBA") == 0 ? "RGBA" : "L", width, height);
if (image == NULL) {
PyMem_Del(glyph_info);
return NULL;

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src/_imagingft.c#L891-L892 

Added lines #L891 - L892 were not covered by tests
}
id = PyLong_AsSsize_t(PyObject_GetAttrString(image, "id"));
im = (Imaging)id;

Expand All @@ -900,7 +904,8 @@
if (stroke_width) {
error = FT_Stroker_New(library, &stroker);
if (error) {
return geterror(error);
geterror(error);
goto glyph_error;

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src/_imagingft.c#L907-L908 

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}

FT_Stroker_Set(
Expand All @@ -923,7 +928,8 @@
error =
FT_Load_Glyph(self->face, glyph_info[i].index, load_flags | FT_LOAD_RENDER);
if (error) {
return geterror(error);
geterror(error);
goto glyph_error;

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src/_imagingft.c#L931-L932 

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}

glyph_slot = self->face->glyph;
Expand Down Expand Up @@ -954,7 +960,8 @@

error = FT_Load_Glyph(self->face, glyph_info[i].index, load_flags);
if (error) {
return geterror(error);
geterror(error);
goto glyph_error;

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src/_imagingft.c#L963-L964 

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}

glyph_slot = self->face->glyph;
Expand All @@ -968,7 +975,8 @@
error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, &origin, 1);
}
if (error) {
return geterror(error);
geterror(error);
goto glyph_error;

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src/_imagingft.c#L978-L979 

Added lines #L978 - L979 were not covered by tests
}

bitmap_glyph = (FT_BitmapGlyph)glyph;
Expand Down Expand Up @@ -1110,6 +1118,12 @@
return Py_BuildValue("O(ii)(ii)", image, width, height, x_offset, y_offset);

glyph_error:
if (im->destroy) {
im->destroy(im);
}
if (im->image) {
free(im->image);
}
if (stroker != NULL) {
FT_Done_Glyph(glyph);
}
Expand Down