of: overlay: Fix memory leak in of_overlay_apply() error path (1352f09b) · Commits · 戴 / test

If of_resolve_phandles() fails, free_overlay_changeset() is called in the error path. However, that function returns early if the list hasn't been initialized yet, before freeing the object. Explicitly calling kfree() instead would solve that issue. However, that complicates matter, by having to consider which of two different methods to use to dispose of the same object. Hence make free_overlay_changeset() consider initialization state of the different parts of the object, making it always safe to call (once!) to dispose of a (partially) initialized overlay_changeset: - Only destroy the changeset if the list was initialized, - Make init_overlay_changeset() store the ID in ovcs->id on success, to avoid calling idr_remove() with an error value or an already released ID. Reported-by:

Colin King <colin.king@canonical.com> Fixes: ("of: overlay: avoid race condition between applying multiple overlays") Signed-off-by:

Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by:

Frank Rowand <frank.rowand@sony.com> Signed-off-by:

Rob Herring <robh@kernel.org>

drivers/of/overlay.c

+8 −8

Original line number	Diff line number	Diff line
		@@ -522,7 +522,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
		struct device_node node, overlay_node;
		struct fragment *fragment;
		struct fragment *fragments;
		int cnt, ret;
		int cnt, id, ret;

		/*
		* Warn for some issues. Can not return -EINVAL for these until
		@@ -543,9 +543,9 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,

		of_changeset_init(&ovcs->cset);

		ovcs->id = idr_alloc(&ovcs_idr, ovcs, 1, 0, GFP_KERNEL);
		if (ovcs->id <= 0)
		return ovcs->id;
		id = idr_alloc(&ovcs_idr, ovcs, 1, 0, GFP_KERNEL);
		if (id <= 0)
		return id;

		cnt = 0;

		@@ -611,6 +611,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
		goto err_free_fragments;
		}

		ovcs->id = id;
		ovcs->count = cnt;
		ovcs->fragments = fragments;

		@@ -619,7 +620,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
		err_free_fragments:
		kfree(fragments);
		err_free_idr:
		idr_remove(&ovcs_idr, ovcs->id);
		idr_remove(&ovcs_idr, id);

		pr_err("%s() failed, ret = %d\n", __func__, ret);

		@@ -630,8 +631,7 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
		{
		int i;

		if (!ovcs->cset.entries.next)
		return;
		if (ovcs->cset.entries.next)
		of_changeset_destroy(&ovcs->cset);

		if (ovcs->id)

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