diff mbox series

[02/13] of: overlay: Call of_changeset_init() early

Message ID c5a96d6b6c95aca366b19e7a995682adcd6c55e5.1689776064.git.geert+renesas@glider.be
State Superseded, archived
Headers show
Series of: overlay/unittest: Miscellaneous fixes and improvements | expand

Checks

Context Check Description
robh/checkpatch warning total: 0 errors, 2 warnings, 15 lines checked
robh/patch-applied fail build log

Commit Message

Geert Uytterhoeven July 19, 2023, 3 p.m. UTC
When of_overlay_fdt_apply() fails, the changeset may be partially
applied, and the caller is still expected to call of_overlay_remove() to
clean up this partial state.

However, of_overlay_apply() calls of_resolve_phandles() before
init_overlay_changeset().  Hence if the overlay fails to apply due to an
unresolved symbol, the overlay_changeset.cset.entries list is still
uninitialized, and cleanup will crash with a NULL-pointer dereference in
overlay_removal_is_ok().

Fix this by moving the call to of_changeset_init() from
init_overlay_changeset() to of_overlay_fdt_apply(), where all other
early initialization is done.

Fixes: f948d6d8b792bb90 ("of: overlay: avoid race condition between applying multiple overlays")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/of/overlay.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 7feb643f13707d34..28b479afd506fdb3 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -752,8 +752,6 @@  static int init_overlay_changeset(struct overlay_changeset *ovcs)
 	if (!of_node_is_root(ovcs->overlay_root))
 		pr_debug("%s() ovcs->overlay_root is not root\n", __func__);
 
-	of_changeset_init(&ovcs->cset);
-
 	cnt = 0;
 
 	/* fragment nodes */
@@ -1013,6 +1011,7 @@  int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
 
 	INIT_LIST_HEAD(&ovcs->ovcs_list);
 	list_add_tail(&ovcs->ovcs_list, &ovcs_list);
+	of_changeset_init(&ovcs->cset);
 
 	/*
 	 * Must create permanent copy of FDT because of_fdt_unflatten_tree()