ACPI: EC: fix use-after-free

This patch fixes a use-after-free introduced by
commit 30c08574da0ead1a47797ce028218ce5b2de61c7
(ACPI: EC: Add new query handler to list head)

Spotted by the Coverity checker.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index bf60b24..06b78e5 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -445,9 +445,9 @@ EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
 
 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
 {
-       struct acpi_ec_query_handler *handler;
+       struct acpi_ec_query_handler *handler, *tmp;
        mutex_lock(&ec->lock);
-       list_for_each_entry(handler, &ec->list, node) {
+       list_for_each_entry_safe(handler, tmp, &ec->list, node) {
                if (query_bit == handler->query_bit) {
                        list_del(&handler->node);
                        kfree(handler);