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Fix missing null dereference checks #9489

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Fix missing null dereference checks #9489

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5945104
Fix missing null dereference checks
wiredfool Mar 24, 2026
477f457
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Mar 24, 2026
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16 changes: 16 additions & 0 deletions src/_avif.c
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Original file line number Diff line number Diff line change
Expand Up @@ -708,15 +708,27 @@ _decoder_get_info(AvifDecoderObject *self) {

if (image->xmp.size) {
xmp = PyBytes_FromStringAndSize((const char *)image->xmp.data, image->xmp.size);
if (!xmp) {
return NULL;
}
}

if (image->exif.size) {
exif =
PyBytes_FromStringAndSize((const char *)image->exif.data, image->exif.size);
if (!exif) {
Py_XDECREF(xmp);
return NULL;
}
}

if (image->icc.size) {
icc = PyBytes_FromStringAndSize((const char *)image->icc.data, image->icc.size);
if (!icc) {
Py_XDECREF(xmp);
Py_XDECREF(exif);
return NULL;
}
}

ret = Py_BuildValue(
Expand Down Expand Up @@ -799,13 +811,17 @@ _decoder_get_frame(AvifDecoderObject *self, PyObject *args) {

if (rgb.height > PY_SSIZE_T_MAX / rgb.rowBytes) {
PyErr_SetString(PyExc_MemoryError, "Integer overflow in pixel size");
// UNDONE avifRGBImageFreePixels(&rgb); ??
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@radarhere radarhere Mar 24, 2026

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Did you want to leave a GitHub comment explaining the uncertainty around this?

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@wiredfool wiredfool Mar 25, 2026

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It looks like it should be there, but I wasn’t sure and it was late.

return NULL;
}

size = rgb.rowBytes * rgb.height;

bytes = PyBytes_FromStringAndSize((char *)rgb.pixels, size);
avifRGBImageFreePixels(&rgb);
if (!bytes) {
return NULL;
}

ret = Py_BuildValue(
"SKKK",
Expand Down
6 changes: 6 additions & 0 deletions src/_imaging.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2469,6 +2469,9 @@ _split(ImagingObject *self) {
}

list = PyTuple_New(self->image->bands);
if (!list) {
return NULL;
}
for (i = 0; i < self->image->bands; i++) {
imaging_object = PyImagingNew(bands[i]);
if (!imaging_object) {
Expand Down Expand Up @@ -3765,6 +3768,9 @@ _ptr_destructor(PyObject *capsule) {
static PyObject *
_getattr_ptr(ImagingObject *self, void *closure) {
PyObject *capsule = PyCapsule_New(self->image, IMAGING_MAGIC, _ptr_destructor);
if (!capsule) {
return NULL;
}
Py_INCREF(self);
PyCapsule_SetContext(capsule, self);
return capsule;
Expand Down
4 changes: 4 additions & 0 deletions src/_imagingft.c
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Expand Up @@ -941,6 +941,10 @@ font_render(FontObject *self, PyObject *args) {
return NULL;
}
PyObject *imagePtr = PyObject_GetAttrString(image, "ptr");
if (!imagePtr) {
PyMem_Del(glyph_info);
return NULL;
}
im = (Imaging)PyCapsule_GetPointer(imagePtr, IMAGING_MAGIC);
Py_XDECREF(imagePtr);

Expand Down
11 changes: 11 additions & 0 deletions src/_imagingmorph.c
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,9 @@ match(PyObject *self, PyObject *args) {
}

imgin = (Imaging)PyCapsule_GetPointer(i0, IMAGING_MAGIC);
if (!imgin) {
return NULL;
}

if (imgin->type != IMAGING_TYPE_UINT8 || imgin->bands != 1) {
PyErr_SetString(PyExc_RuntimeError, "Unsupported image type");
Expand Down Expand Up @@ -185,6 +188,10 @@ match(PyObject *self, PyObject *args) {
(b6 << 6) | (b7 << 7) | (b8 << 8));
if (lut[lut_idx]) {
PyObject *coordObj = Py_BuildValue("(nn)", col_idx, row_idx);
if (!coordObj) {
Py_XDECREF(ret);
return NULL;
}
PyList_Append(ret, coordObj);
Py_XDECREF(coordObj);
}
Expand Down Expand Up @@ -230,6 +237,10 @@ get_on_pixels(PyObject *self, PyObject *args) {
for (col_idx = 0; col_idx < width; col_idx++) {
if (row[col_idx]) {
PyObject *coordObj = Py_BuildValue("(nn)", col_idx, row_idx);
if (!coordObj) {
Py_XDECREF(ret);
return NULL;
}
PyList_Append(ret, coordObj);
Py_XDECREF(coordObj);
}
Expand Down
3 changes: 3 additions & 0 deletions src/_webp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -503,6 +503,9 @@ _anim_decoder_get_next(PyObject *self) {
bytes = PyBytes_FromStringAndSize(
(char *)buf, decp->info.canvas_width * 4 * decp->info.canvas_height
);
if (!bytes) {
return NULL;
}

ret = Py_BuildValue("Si", bytes, timestamp);

Expand Down
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