[PATCH 2/2] mtd: virt-concat: unlink discarded items before freeing

[Harshit Mogalapalli]

mtd_virt_concat_destroy_items() frees each item without removing it
from concat_node_list. list_for_each_entry_safe() protects the
current traversal, but concat_node_list still points to the freed
items afterward.

The function also unwinds errors from mtd_virt_concat_node_create().

A later initialization can traverse a freed item in
mtd_is_part_concat(), causing a use-after-free.

Unlink each item before freeing it.

Fixes: 43db6366fc2d ("mtd: Add driver for concatenating devices")
Cc: stable@xxxxxxxxxxxxxxx
Assisted-by: Codex:gpt-5.6, smatch
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
---
Was writing a Smatch check for list APIs and found this. Only compile
tested.
---
 drivers/mtd/mtd_virt_concat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/mtd_virt_concat.c b/drivers/mtd/mtd_virt_concat.c
index 1443f0e4c7cb..40b300021dda 100644
--- a/drivers/mtd/mtd_virt_concat.c
+++ b/drivers/mtd/mtd_virt_concat.c
@@ -202,6 +202,7 @@ void mtd_virt_concat_destroy_items(void)
 	int i;
 
 	list_for_each_entry_safe(item, temp, &concat_node_list, head) {
+		list_del(&item->head);
 		for (i = 0; i < item->count; i++)
 			of_node_put(item->nodes[i]);
 
-- 
2.52.0