main: unref another pkg

Which ensures that memory handling is done correctly.

.github/workflows/test.yml

@@ -60,6 +60,30 @@ jobs:
         run: |
           meson test -v -C _build
 
+  debian-meson-asan:
+    runs-on: ubuntu-latest
+    container:
+      image: debian:testing
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Update system and add dependencies
+        run: |
+          apt-get update
+          apt-get install -y kyua atf-sh build-essential meson
+
+      - name: Build
+        run: |
+          meson _build -Db_sanitize=address
+          meson compile -C _build
+
+      - name: Run tests
+        run: |
+          meson test -v -C _build
+        env:
+          ASAN_OPTIONS: "exitcode=7"
+
   debian-autotools:
     runs-on: ubuntu-latest
     container:

.woodpecker.yml

@@ -12,6 +12,21 @@ pipeline:
         IMAGE: debian
         BUILD: meson
 
+  debian-meson-asan:
+    image: debian:testing
+    environment:
+      - ASAN_OPTIONS="exitcode=7"
+    commands:
+      - apt-get update
+      - apt-get install -y kyua atf-sh build-essential meson
+      - meson _build -Db_sanitize=address
+      - meson compile -C _build
+      - meson test -v -C _build
+    when:
+      matrix:
+        IMAGE: debian
+        BUILD: meson
+
   debian-autotools:
     image: debian:testing
     commands:

cli/main.c

@@ -1162,7 +1162,7 @@ main(int argc, char *argv[])
 
 	if (required_module_version != NULL)
 	{
-		pkgconf_pkg_t *pkg;
+		pkgconf_pkg_t *pkg = NULL;
 		pkgconf_node_t *node;
 		pkgconf_list_t deplist = PKGCONF_LIST_INITIALIZER;
 
@@ -1183,22 +1183,26 @@ main(int argc, char *argv[])
 					pkgconf_error(&pkg_client, "Package '%s' was not found\n", pkgiter->package);
 
 				ret = EXIT_FAILURE;
-				goto out;
+				goto cleanup;
 			}
 
 			if (pkgconf_compare_version(pkg->version, required_module_version) >= 0)
 			{
 				ret = EXIT_SUCCESS;
-				goto out;
+				goto cleanup;
 			}
 		}
 
 		ret = EXIT_FAILURE;
+cleanup:
+		if (pkg)
+			pkgconf_pkg_unref(&pkg_client, pkg);
+		pkgconf_dependency_free(&deplist);
 		goto out;
 	}
 	else if (required_exact_module_version != NULL)
 	{
-		pkgconf_pkg_t *pkg;
+		pkgconf_pkg_t *pkg = NULL;
 		pkgconf_node_t *node;
 		pkgconf_list_t deplist = PKGCONF_LIST_INITIALIZER;
 
@@ -1219,22 +1223,26 @@ main(int argc, char *argv[])
 					pkgconf_error(&pkg_client, "Package '%s' was not found\n", pkgiter->package);
 
 				ret = EXIT_FAILURE;
-				goto out;
+				goto cleanup2;
 			}
 
 			if (pkgconf_compare_version(pkg->version, required_exact_module_version) == 0)
 			{
 				ret = EXIT_SUCCESS;
-				goto out;
+				goto cleanup2;
 			}
 		}
 
 		ret = EXIT_FAILURE;
+cleanup2:
+		if (pkg)
+			pkgconf_pkg_unref(&pkg_client, pkg);
+		pkgconf_dependency_free(&deplist);
 		goto out;
 	}
 	else if (required_max_module_version != NULL)
 	{
-		pkgconf_pkg_t *pkg;
+		pkgconf_pkg_t *pkg = NULL;
 		pkgconf_node_t *node;
 		pkgconf_list_t deplist = PKGCONF_LIST_INITIALIZER;
 
@@ -1255,17 +1263,21 @@ main(int argc, char *argv[])
 					pkgconf_error(&pkg_client, "Package '%s' was not found\n", pkgiter->package);
 
 				ret = EXIT_FAILURE;
-				goto out;
+				goto cleanup3;
 			}
 
 			if (pkgconf_compare_version(pkg->version, required_max_module_version) <= 0)
 			{
 				ret = EXIT_SUCCESS;
-				goto out;
+				goto cleanup3;
 			}
 		}
 
 		ret = EXIT_FAILURE;
+cleanup3:
+		if (pkg)
+			pkgconf_pkg_unref(&pkg_client, pkg);
+		pkgconf_dependency_free(&deplist);
 		goto out;
 	}
 
@@ -1337,7 +1349,7 @@ main(int argc, char *argv[])
 	}
 
 	if ((want_flags & PKG_VALIDATE) == PKG_VALIDATE)
-		return 0;
+		goto out;
 
 	if ((want_flags & PKG_UNINSTALLED) == PKG_UNINSTALLED)
 	{

libpkgconf/cache.c

@@ -86,6 +86,9 @@ cache_dump(const pkgconf_client_t *client)
 pkgconf_pkg_t *
 pkgconf_cache_lookup(pkgconf_client_t *client, const char *id)
 {
+	if (client->cache_table == NULL)
+		return NULL;
+
 	pkgconf_pkg_t **pkg;
 
 	pkg = bsearch(id, client->cache_table,
@@ -153,6 +156,9 @@ pkgconf_cache_remove(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
 	if (pkg == NULL)
 		return;
 
+	if (client->cache_table == NULL)
+		return;
+
 	if (!(pkg->flags & PKGCONF_PKG_PROPF_CACHED))
 		return;
 
@@ -167,6 +173,8 @@ pkgconf_cache_remove(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
 	if (slot == NULL)
 		return;
 
+	pkg->flags &= ~PKGCONF_PKG_PROPF_CACHED;
+	pkgconf_pkg_unref(client, pkg);
 	*slot = NULL;
 
 	qsort(client->cache_table, client->cache_count,
@@ -181,19 +189,14 @@ pkgconf_cache_remove(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
 	}
 
 	client->cache_count--;
+	if (client->cache_count == 0) {
+		free(client->cache_table);
+		client->cache_table = NULL;
+	}
+	else
+	{
 		client->cache_table = pkgconf_reallocarray(client->cache_table,
 			client->cache_count, sizeof(void *));
-}
-
-static inline void
-clear_dependency_matches(pkgconf_list_t *list)
-{
-	pkgconf_node_t *iter;
-
-	PKGCONF_FOREACH_LIST_ENTRY(list->head, iter)
-	{
-		pkgconf_dependency_t *dep = iter->data;
-		dep->match = NULL;
 	}
 }
 
@@ -211,30 +214,12 @@ clear_dependency_matches(pkgconf_list_t *list)
 void
 pkgconf_cache_free(pkgconf_client_t *client)
 {
-	pkgconf_pkg_t **cache_table;
+	if (client->cache_table == NULL)
-	size_t i, count;
+		PKGCONF_TRACE(client, "cache is empty, not clearing");
+		return;
 
-	cache_table = pkgconf_reallocarray(NULL, client->cache_count, sizeof (void *));
+	while (client->cache_count > 0)
-	memcpy(cache_table, client->cache_table,
+		pkgconf_cache_remove(client, client->cache_table[0]);
-		client->cache_count * sizeof (void *));
-
-	/* first we clear cached match pointers */
-	for (i = 0, count = client->cache_count; i < count; i++)
-	{
-		pkgconf_pkg_t *pkg = cache_table[i];
-
-		clear_dependency_matches(&pkg->required);
-		clear_dependency_matches(&pkg->requires_private);
-		clear_dependency_matches(&pkg->provides);
-		clear_dependency_matches(&pkg->conflicts);
-	}
-
-	/* now forcibly free everything */
-	for (i = 0, count = client->cache_count; i < count; i++)
-	{
-		pkgconf_pkg_t *pkg = cache_table[i];
-		pkgconf_pkg_free(client, pkg);
-	}
 
 	PKGCONF_TRACE(client, "cleared package cache");
 }

libpkgconf/dependency.c

@@ -16,6 +16,8 @@
 #include <libpkgconf/stdinc.h>
 #include <libpkgconf/libpkgconf.h>
 
+#include <assert.h>
+
 /*
  * !doc
  *
@@ -113,7 +115,7 @@ add_or_replace_dependency_node(pkgconf_client_t *client, pkgconf_dependency_t *d
 	}
 
 	PKGCONF_TRACE(client, "added dependency [%s] to list @%p; flags=%x", dependency_to_str(dep, depbuf, sizeof depbuf), list, dep->flags);
-	pkgconf_node_insert_tail(&dep->iter, dep, list);
+	pkgconf_node_insert_tail(&dep->iter, pkgconf_dependency_ref(dep->owner, dep), list);
 
 	return pkgconf_dependency_ref(dep->owner, dep);
 }
@@ -195,6 +197,9 @@ pkgconf_dependency_free_one(pkgconf_dependency_t *dep)
 	if (dep->match != NULL)
 		pkgconf_pkg_unref(dep->match->owner, dep->match);
 
+	if (dep->parent != NULL)
+		pkgconf_pkg_unref(dep->match->owner, dep->parent);
+
 	if (dep->package != NULL)
 		free(dep->package);
 
@@ -222,6 +227,7 @@ pkgconf_dependency_ref(pkgconf_client_t *client, pkgconf_dependency_t *dep)
 		return NULL;
 
 	dep->refcount++;
+	PKGCONF_TRACE(client, "%s: refcount@%p: %d", dep->package, dep, dep->refcount);
 	return dep;
 }
 
@@ -242,7 +248,10 @@ pkgconf_dependency_unref(pkgconf_client_t *client, pkgconf_dependency_t *dep)
 	if (client != dep->owner)
 		return;
 
-	if (--dep->refcount <= 0)
+	dep->refcount--;
+	assert(dep->refcount >= 0);
+	PKGCONF_TRACE(client, "%s: refcount@%p: %d", dep->package, dep, dep->refcount);
+	if (dep->refcount == 0)
 		pkgconf_dependency_free_one(dep);
 }
 
@@ -354,7 +363,8 @@ pkgconf_dependency_parse_str(pkgconf_client_t *client, pkgconf_list_t *deplist_h
 
 			if (state == OUTSIDE_MODULE)
 			{
-				pkgconf_dependency_addraw(client, deplist_head, package, package_sz, NULL, 0, compare, flags);
+				pkgconf_dependency_t *dep = pkgconf_dependency_addraw(client, deplist_head, package, package_sz, NULL, 0, compare, flags);
+				pkgconf_dependency_unref(dep->owner, dep);
 
 				compare = PKGCONF_CMP_ANY;
 				package_sz = 0;
@@ -398,7 +408,8 @@ pkgconf_dependency_parse_str(pkgconf_client_t *client, pkgconf_list_t *deplist_h
 				version_sz = ptr - vstart;
 				state = OUTSIDE_MODULE;
 
-				pkgconf_dependency_addraw(client, deplist_head, package, package_sz, version, version_sz, compare, flags);
+				pkgconf_dependency_t *dep = pkgconf_dependency_addraw(client, deplist_head, package, package_sz, version, version_sz, compare, flags);
+				pkgconf_dependency_unref(dep->owner, dep);
 
 				compare = PKGCONF_CMP_ANY;
 				cnameptr = cmpname;

libpkgconf/pkg.c

@@ -17,6 +17,8 @@
 #include <libpkgconf/stdinc.h>
 #include <libpkgconf/libpkgconf.h>
 
+#include <assert.h>
+
 /*
  * !doc
  *
@@ -451,7 +453,8 @@ pkgconf_pkg_new_from_file(pkgconf_client_t *client, const char *filename, FILE *
 		return NULL;
 	}
 
-	pkgconf_dependency_add(client, &pkg->provides, pkg->id, pkg->version, PKGCONF_CMP_EQUAL, 0);
+	pkgconf_dependency_t *dep = pkgconf_dependency_add(client, &pkg->provides, pkg->id, pkg->version, PKGCONF_CMP_EQUAL, 0);
+	pkgconf_dependency_unref(dep->owner, dep);
 
 	return pkgconf_pkg_ref(client, pkg);
 }
@@ -514,6 +517,8 @@ pkgconf_pkg_free(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
 	if (pkg->pc_filedir != NULL)
 		free(pkg->pc_filedir);
 
+	/* We shouldn't be trying to free this if someone is still holding a reference to it */
+	assert(pkg->refcount == 0);
 	free(pkg);
 }
 
@@ -536,7 +541,7 @@ pkgconf_pkg_ref(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
 		PKGCONF_TRACE(client, "WTF: client %p refers to package %p owned by other client %p", client, pkg, pkg->owner);
 
 	pkg->refcount++;
-	PKGCONF_TRACE(client, "refcount@%p: %d", pkg, pkg->refcount);
+	PKGCONF_TRACE(client, "%s: refcount@%p: %d", pkg->id, pkg, pkg->refcount);
 
 	return pkg;
 }
@@ -559,7 +564,7 @@ pkgconf_pkg_unref(pkgconf_client_t *client, pkgconf_pkg_t *pkg)
 		PKGCONF_TRACE(client, "WTF: client %p unrefs package %p owned by other client %p", client, pkg, pkg->owner);
 
 	pkg->refcount--;
-	PKGCONF_TRACE(pkg->owner, "refcount@%p: %d", pkg, pkg->refcount);
+	PKGCONF_TRACE(pkg->owner, "%s: refcount@%p: %d", pkg->id, pkg, pkg->refcount);
 
 	if (pkg->refcount <= 0)
 		pkgconf_pkg_free(pkg->owner, pkg);

libpkgconf/queue.c

@@ -116,6 +116,18 @@ pkgconf_queue_collect_dependents(pkgconf_client_t *client, pkgconf_pkg_t *pkg, v
 	if (pkg == world)
 		return;
 
+	if ((pkg->flags & PKGCONF_PKG_PROPF_STATIC) == PKGCONF_PKG_PROPF_STATIC) {
+		PKGCONF_FOREACH_LIST_ENTRY(pkg->requires_private.head, node)
+		{
+			pkgconf_dependency_t *flattened_dep;
+
+			flattened_dep = pkgconf_dependency_copy(client, node->data);
+
+			pkgconf_node_insert(&flattened_dep->iter, flattened_dep, &world->requires_private);
+		}
+	}
+	else
+	{
 		PKGCONF_FOREACH_LIST_ENTRY(pkg->required.head, node)
 		{
 			pkgconf_dependency_t *flattened_dep;
@@ -124,14 +136,6 @@ pkgconf_queue_collect_dependents(pkgconf_client_t *client, pkgconf_pkg_t *pkg, v
 
 			pkgconf_node_insert(&flattened_dep->iter, flattened_dep, &world->required);
 		}
-
-	PKGCONF_FOREACH_LIST_ENTRY(pkg->requires_private.head, node)
-	{
-		pkgconf_dependency_t *flattened_dep;
-
-		flattened_dep = pkgconf_dependency_copy(client, node->data);
-
-		pkgconf_node_insert(&flattened_dep->iter, flattened_dep, &world->requires_private);
 	}
 }
 
@@ -147,11 +151,11 @@ dep_sort_cmp(const void *a, const void *b)
 static inline void
 flatten_dependency_set(pkgconf_client_t *client, pkgconf_list_t *list)
 {
-	pkgconf_node_t *node;
+	pkgconf_node_t *node, *next;
 	pkgconf_dependency_t **deps = NULL;
 	size_t dep_count = 0, i;
 
-	PKGCONF_FOREACH_LIST_ENTRY(list->head, node)
+	PKGCONF_FOREACH_LIST_ENTRY_SAFE(list->head, next, node)
 	{
 		pkgconf_dependency_t *dep = node->data;
 		pkgconf_pkg_t *pkg = pkgconf_pkg_verify_dependency(client, dep, NULL);
@@ -160,7 +164,11 @@ flatten_dependency_set(pkgconf_client_t *client, pkgconf_list_t *list)
 			continue;
 
 		if (pkg->serial == client->serial)
-			continue;
+		{
+			PKGCONF_TRACE(client, "dedup %s serials match", pkg->id);
+			pkgconf_dependency_unref(dep->owner, dep);
+			goto next;
+		}
 
 		if (dep->match == NULL)
 		{
@@ -178,6 +186,7 @@ flatten_dependency_set(pkgconf_client_t *client, pkgconf_list_t *list)
 			if (!strcmp(dep->package, other_dep->package))
 			{
 				PKGCONF_TRACE(client, "skipping, %zu deps", dep_count);
+				pkgconf_dependency_unref(dep->owner, dep);
 				goto next;
 			}
 		}
@@ -191,9 +200,13 @@ flatten_dependency_set(pkgconf_client_t *client, pkgconf_list_t *list)
 
 		PKGCONF_TRACE(client, "added %s to dep table", dep->package);
 
-next:;
+next:
+		pkgconf_pkg_unref(client, pkg);
 	}
 
+	if (deps == NULL)
+		return;
+
 	qsort(deps, dep_count, sizeof (void *), dep_sort_cmp);
 
 	/* zero the list and start readding */
@@ -266,24 +279,28 @@ pkgconf_queue_apply(pkgconf_client_t *client, pkgconf_list_t *list, pkgconf_queu
 		.realname = "virtual world package",
 		.flags = PKGCONF_PKG_PROPF_STATIC | PKGCONF_PKG_PROPF_VIRTUAL,
 	};
+	bool ret = false;
 
 	/* if maxdepth is one, then we will not traverse deeper than our virtual package. */
 	if (!maxdepth)
 		maxdepth = -1;
 
 	if (pkgconf_queue_verify(client, &world, list, maxdepth) != PKGCONF_PKG_ERRF_OK)
-		return false;
+	{
+		goto out;
+	}
 
 	/* the world dependency set is flattened after it is returned from pkgconf_queue_verify */
 	if (!func(client, &world, data, maxdepth))
 	{
-		pkgconf_pkg_free(client, &world);
+		goto out;
-		return false;
 	}
 
-	pkgconf_pkg_free(client, &world);
 
-	return true;
+	ret = true;
+out:
+	pkgconf_pkg_free(client, &world);
+	return ret;
 }
 
 /*