Valgrind Memory Leak Checking

.github/workflows/test-valgrind-memory.yml

@@ -0,0 +1,60 @@
+name: Test Valgrind Memory Leaks
+
+# like the Docker tests, but running valgrind only on *.c/*.h changes.
+
+# this is very expensive. Only run on the pull request.
+on:
+  # push:
+  #   branches:
+  #     - "**"
+  #   paths:
+  #     - ".github/workflows/test-valgrind.yml"
+  #     - "**.c"
+  #     - "**.h"
+  pull_request:
+    paths:
+      - ".github/workflows/test-valgrind.yml"
+      - "**.c"
+      - "**.h"
+      - "depends/docker-test-valgrind-memory.sh"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        docker: [
+          ubuntu-22.04-jammy-amd64-valgrind,
+        ]
+        dockerTag: [main]
+
+    name: ${{ matrix.docker }}
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        persist-credentials: false
+
+    - name: Build system information
+      run: python3 .github/workflows/system-info.py
+
+    - name: Docker pull
+      run: |
+        docker pull pythonpillow/${{ matrix.docker }}:${{ matrix.dockerTag }}
+
+    - name: Build and Run Valgrind
+      run: |
+        # The Pillow user in the docker container is UID 1001
+        sudo chown -R 1001 $GITHUB_WORKSPACE
+        docker run --name pillow_container -e "PILLOW_VALGRIND_TEST=true" -v $GITHUB_WORKSPACE:/Pillow pythonpillow/${{ matrix.docker }}:${{ matrix.dockerTag }} /Pillow/depends/docker-test-valgrind-memory.sh
+        sudo chown -R runner $GITHUB_WORKSPACE

Makefile

@@ -100,10 +100,18 @@ test:
 .PHONY: valgrind
 valgrind:
 	python3 -c "import pytest_valgrind" > /dev/null 2>&1 || python3 -m pip install pytest-valgrind
-	PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss-fuzz/python.supp --leak-check=no \
+	PILLOW_VALGRIND_TEST=true PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss-fuzz/python.supp --leak-check=no \
             --log-file=/tmp/valgrind-output \
             python3 -m pytest --no-memcheck -vv --valgrind --valgrind-log=/tmp/valgrind-output
 
+.PHONY: valgrind-leak
+valgrind-leak:
+	python3 -c "import pytest_valgrind" > /dev/null 2>&1 || python3 -m pip install pytest-valgrind
+	PILLOW_VALGRIND_TEST=true PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss-fuzz/python.supp \
+	    --leak-check=full --show-leak-kinds=definite --errors-for-leak-kinds=definite \
+            --log-file=/tmp/valgrind-output \
+            python3 -m pytest -vv --valgrind --valgrind-log=/tmp/valgrind-output
+
 .PHONY: readme
 readme:
 	python3 -c "import markdown2" > /dev/null 2>&1 || python3 -m pip install markdown2

Tests/oss-fuzz/python.supp

@@ -14,3 +14,23 @@
    fun:_TIFFReadEncodedTileAndAllocBuffer
    ...
 }
+
+{
+   <python_alloc_possible_leak>
+   Memcheck:Leak
+   match-leak-kinds: all
+   fun:malloc
+   fun:_PyMem_RawMalloc
+   fun:PyObject_Malloc
+   ...
+}
+
+{
+   <python_realloc_possible_leak>
+   Memcheck:Leak
+   match-leak-kinds: all
+   fun:malloc
+   fun:_PyMem_RawRealloc
+   fun:PyMem_Realloc
+   ...
+}

depends/docker-test-valgrind-memory.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+## Run this as the test script in the Docker valgrind image.
+## Note -- can be included directly into the Docker image,
+## but requires the current python.supp.
+
+source /vpy3/bin/activate
+cd /Pillow
+make clean
+make install
+make valgrind-leak

src/_imaging.c

@@ -2226,6 +2226,7 @@ _unsharp_mask(ImagingObject *self, PyObject *args) {
     }
 
     if (!ImagingUnsharpMask(imOut, imIn, radius, percent, threshold)) {
+        ImagingDelete(imOut);
         return NULL;
     }
 

src/_imagingft.c

@@ -275,6 +275,7 @@ text_layout_raqm(
         if (!text || !size) {
             /* return 0 and clean up, no glyphs==no size,
                and raqm fails with empty strings */
+            PyMem_Free(text);
             goto failed;
         }
         set_text = raqm_set_text(rq, text, size);
@@ -425,6 +426,7 @@ text_layout_fallback(
             "setting text direction, language or font features is not supported "
             "without libraqm"
         );
+        return 0;
     }
 
     if (PyUnicode_Check(string)) {

src/_webp.c

@@ -641,6 +641,10 @@ WebPEncode_wrapper(PyObject *self, PyObject *args) {
     ImagingSectionLeave(&cookie);
 
     WebPPictureFree(&pic);
+
+    output = writer.mem;
+    ret_size = writer.size;
+
     if (!ok) {
         int error_code = (&pic)->error_code;
         char message[50] = "";
@@ -652,10 +656,9 @@ WebPEncode_wrapper(PyObject *self, PyObject *args) {
             );
         }
         PyErr_Format(PyExc_ValueError, "encoding error %d%s", error_code, message);
+        free(output);
         return NULL;
     }
-    output = writer.mem;
-    ret_size = writer.size;
 
     {
         /* I want to truncate the *_size items that get passed into WebP

src/encode.c

@@ -703,6 +703,8 @@ PyImaging_LibTiffEncoderNew(PyObject *self, PyObject *args) {
         return NULL;
     }
 
+    encoder->cleanup = ImagingLibTiffEncodeCleanup;
+
     num_core_tags = sizeof(core_tags) / sizeof(int);
     for (pos = 0; pos < tags_size; pos++) {
         item = PyList_GetItemRef(tags, pos);

src/libImaging/Arrow.c

@@ -36,7 +36,10 @@
             child->release(child);
             child->release = NULL;
         }
-        // UNDONE -- should I be releasing the children?
+        free(array->children[i]);
+    }
+    if (array->children) {
+        free(array->children);
     }
 
     // Release dictionary
@@ -117,6 +120,7 @@
     retval = export_named_type(schema->children[0], im->arrow_band_format, "pixel");
     if (retval != 0) {
         free(schema->children[0]);
+        free(schema->children);
         schema->release(schema);
         return retval;
     }
@@ -127,9 +131,7 @@
 release_const_array(struct ArrowArray *array) {
     Imaging im = (Imaging)array->private_data;
 
-    if (array->n_children == 0) {
-        ImagingDelete(im);
-    }
+    ImagingDelete(im);
 
     //  Free the buffers and the buffers array
     if (array->buffers) {

src/libImaging/JpegEncode.c

@@ -131,6 +131,7 @@
                     break;
                 default:
                     state->errcode = IMAGING_CODEC_CONFIG;
+                    jpeg_destroy_compress(&context->cinfo);
                     return -1;
             }
 
@@ -161,6 +162,7 @@
                                 /* Would subsample the green and blue
                                    channels, which doesn't make sense */
                                 state->errcode = IMAGING_CODEC_CONFIG;
+                                jpeg_destroy_compress(&context->cinfo);
                                 return -1;
                         }
                         jpeg_set_colorspace(&context->cinfo, JCS_RGB);

src/libImaging/TiffDecode.c

@@ -929,6 +929,27 @@
     return status;
 }
 
+int
+ImagingLibTiffEncodeCleanup(ImagingCodecState state) {
+    TIFFSTATE *clientstate = (TIFFSTATE *)state->context;
+    TIFF *tiff = clientstate->tiff;
+
+    if (!tiff) {
+        return 0;
+    }
+    // TIFFClose in libtiff calls tif_closeproc and TIFFCleanup
+    if (clientstate->fp) {
+        // Python will manage the closing of the file rather than libtiff
+        // So only call TIFFCleanup
+        TIFFCleanup(tiff);
+    } else {
+        // When tif_closeproc refers to our custom _tiffCloseProc though,
+        // that is fine, as it does not close the file
+        TIFFClose(tiff);
+    }
+    return 0;
+}
+
 int
 ImagingLibTiffEncode(Imaging im, ImagingCodecState state, UINT8 *buffer, int bytes) {
     /* One shot encoder. Encode everything to the tiff in the clientstate.
@@ -1010,16 +1031,6 @@
                 TRACE(("Encode Error, row %d\n", state->y));
                 state->errcode = IMAGING_CODEC_BROKEN;
 
-                // TIFFClose in libtiff calls tif_closeproc and TIFFCleanup
-                if (clientstate->fp) {
-                    // Python will manage the closing of the file rather than libtiff
-                    // So only call TIFFCleanup
-                    TIFFCleanup(tiff);
-                } else {
-                    // When tif_closeproc refers to our custom _tiffCloseProc though,
-                    // that is fine, as it does not close the file
-                    TIFFClose(tiff);
-                }
                 if (!clientstate->fp) {
                     free(clientstate->data);
                 }
@@ -1036,22 +1047,11 @@
                 TRACE(("Error flushing the tiff"));
                 // likely reason is memory.
                 state->errcode = IMAGING_CODEC_MEMORY;
-                if (clientstate->fp) {
-                    TIFFCleanup(tiff);
-                } else {
-                    TIFFClose(tiff);
-                }
                 if (!clientstate->fp) {
                     free(clientstate->data);
                 }
                 return -1;
             }
-            TRACE(("Closing \n"));
-            if (clientstate->fp) {
-                TIFFCleanup(tiff);
-            } else {
-                TIFFClose(tiff);
-            }
             // reset the clientstate metadata to use it to read out the buffer.
             clientstate->loc = 0;
             clientstate->size = clientstate->eof;  // redundant?

src/libImaging/TiffDecode.h

@@ -40,6 +40,8 @@ ImagingLibTiffInit(ImagingCodecState state, int fp, uint32_t offset);
 extern int
 ImagingLibTiffEncodeInit(ImagingCodecState state, char *filename, int fp);
 extern int
+ImagingLibTiffEncodeCleanup(ImagingCodecState state);
+extern int
 ImagingLibTiffMergeFieldInfo(
     ImagingCodecState state, TIFFDataType field_type, int key, int is_var_length
 );