usb: gadget: rndis: add spinlock for rndis response list

There's no lock for rndis response list. It could cause list corruption
if there're two different list_add at the same time like below.
It's better to add in rndis_add_response / rndis_free_response
/ rndis_get_next_response to prevent any race condition on response list.

[  361.894299] [1:   irq/191-dwc3:16979] list_add corruption.
next->prev should be prev (ffffff80651764d0),
but was ffffff883dc36f80. (next=ffffff80651764d0).

[  361.904380] [1:   irq/191-dwc3:16979] Call trace:
[  361.904391] [1:   irq/191-dwc3:16979]  __list_add_valid+0x74/0x90
[  361.904401] [1:   irq/191-dwc3:16979]  rndis_msg_parser+0x168/0x8c0
[  361.904409] [1:   irq/191-dwc3:16979]  rndis_command_complete+0x24/0x84
[  361.904417] [1:   irq/191-dwc3:16979]  usb_gadget_giveback_request+0x20/0xe4
[  361.904426] [1:   irq/191-dwc3:16979]  dwc3_gadget_giveback+0x44/0x60
[  361.904434] [1:   irq/191-dwc3:16979]  dwc3_ep0_complete_data+0x1e8/0x3a0
[  361.904442] [1:   irq/191-dwc3:16979]  dwc3_ep0_interrupt+0x29c/0x3dc
[  361.904450] [1:   irq/191-dwc3:16979]  dwc3_process_event_entry+0x78/0x6cc
[  361.904457] [1:   irq/191-dwc3:16979]  dwc3_process_event_buf+0xa0/0x1ec
[  361.904465] [1:   irq/191-dwc3:16979]  dwc3_thread_interrupt+0x34/0x5c

Fixes: f6281af9d62e ("usb: gadget: rndis: use list_for_each_entry_safe")
Cc: stable <stable@kernel.org>
Signed-off-by: Daehwan Jung <dh10.jung@samsung.com>
Link: https://lore.kernel.org/r/1645507768-77687-1-git-send-email-dh10.jung@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index b7ccf18..00b3f6b 100644 (file)
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -922,6 +922,7 @@ struct rndis_params *rndis_register(void (*resp_avail)(void *v), void *v)
        params->resp_avail = resp_avail;
        params->v = v;
        INIT_LIST_HEAD(&params->resp_queue);
+       spin_lock_init(&params->resp_lock);
        pr_debug("%s: configNr = %d\n", __func__, i);
 
        return params;
@@ -1015,12 +1016,14 @@ void rndis_free_response(struct rndis_params *params, u8 *buf)
 {
        rndis_resp_t *r, *n;
 
+       spin_lock(&params->resp_lock);
        list_for_each_entry_safe(r, n, &params->resp_queue, list) {
                if (r->buf == buf) {
                        list_del(&r->list);
                        kfree(r);
                }
        }
+       spin_unlock(&params->resp_lock);
 }
 EXPORT_SYMBOL_GPL(rndis_free_response);
 
@@ -1030,14 +1033,17 @@ u8 *rndis_get_next_response(struct rndis_params *params, u32 *length)
 
        if (!length) return NULL;
 
+       spin_lock(&params->resp_lock);
        list_for_each_entry_safe(r, n, &params->resp_queue, list) {
                if (!r->send) {
                        r->send = 1;
                        *length = r->length;
+                       spin_unlock(&params->resp_lock);
                        return r->buf;
                }
        }
 
+       spin_unlock(&params->resp_lock);
        return NULL;
 }
 EXPORT_SYMBOL_GPL(rndis_get_next_response);
@@ -1054,7 +1060,9 @@ static rndis_resp_t *rndis_add_response(struct rndis_params *params, u32 length)
        r->length = length;
        r->send = 0;
 
+       spin_lock(&params->resp_lock);
        list_add_tail(&r->list, &params->resp_queue);
+       spin_unlock(&params->resp_lock);
        return r;
 }
 

diff --git a/drivers/usb/gadget/function/rndis.h b/drivers/usb/gadget/function/rndis.h
index f6167f7..6206b8b 100644 (file)
--- a/drivers/usb/gadget/function/rndis.h
+++ b/drivers/usb/gadget/function/rndis.h
@@ -174,6 +174,7 @@ typedef struct rndis_params {
        void                    (*resp_avail)(void *v);
        void                    *v;
        struct list_head        resp_queue;
+       spinlock_t              resp_lock;
 } rndis_params;
 
 /* RNDIS Message parser and other useless functions */