[PATCH 5.15 002/215] char: xillybus: Dont destroy workqueue from work item running on it

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eli Billauer <eli.billauer@xxxxxxxxx>

commit ccbde4b128ef9c73d14d0d7817d68ef795f6d131 upstream.

Triggered by a kref decrement, destroy_workqueue() may be called from
within a work item for destroying its own workqueue. This illegal
situation is averted by adding a module-global workqueue for exclusive
use of the offending work item. Other work items continue to be queued
on per-device workqueues to ensure performance.

Reported-by: syzbot+91dbdfecdd3287734d8e@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: stable <stable@xxxxxxxxxx>
Closes: https://lore.kernel.org/lkml/0000000000000ab25a061e1dfe9f@xxxxxxxxxx/
Signed-off-by: Eli Billauer <eli.billauer@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240801121126.60183-1-eli.billauer@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/char/xillybus/xillyusb.c |   16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

--- a/drivers/char/xillybus/xillyusb.c
+++ b/drivers/char/xillybus/xillyusb.c
@@ -50,6 +50,7 @@ MODULE_LICENSE("GPL v2");
 static const char xillyname[] = "xillyusb";
 
 static unsigned int fifo_buf_order;
+static struct workqueue_struct *wakeup_wq;
 
 #define USB_VENDOR_ID_XILINX		0x03fd
 #define USB_VENDOR_ID_ALTERA		0x09fb
@@ -561,10 +562,6 @@ static void cleanup_dev(struct kref *kre
  * errors if executed. The mechanism relies on that xdev->error is assigned
  * a non-zero value by report_io_error() prior to queueing wakeup_all(),
  * which prevents bulk_in_work() from calling process_bulk_in().
- *
- * The fact that wakeup_all() and bulk_in_work() are queued on the same
- * workqueue makes their concurrent execution very unlikely, however the
- * kernel's API doesn't seem to ensure this strictly.
  */
 
 static void wakeup_all(struct work_struct *work)
@@ -619,7 +616,7 @@ static void report_io_error(struct xilly
 
 	if (do_once) {
 		kref_get(&xdev->kref); /* xdev is used by work item */
-		queue_work(xdev->workq, &xdev->wakeup_workitem);
+		queue_work(wakeup_wq, &xdev->wakeup_workitem);
 	}
 }
 
@@ -2242,6 +2239,10 @@ static int __init xillyusb_init(void)
 {
 	int rc = 0;
 
+	wakeup_wq = alloc_workqueue(xillyname, 0, 0);
+	if (!wakeup_wq)
+		return -ENOMEM;
+
 	if (LOG2_INITIAL_FIFO_BUF_SIZE > PAGE_SHIFT)
 		fifo_buf_order = LOG2_INITIAL_FIFO_BUF_SIZE - PAGE_SHIFT;
 	else
@@ -2249,11 +2250,16 @@ static int __init xillyusb_init(void)
 
 	rc = usb_register(&xillyusb_driver);
 
+	if (rc)
+		destroy_workqueue(wakeup_wq);
+
 	return rc;
 }
 
 static void __exit xillyusb_exit(void)
 {
+	destroy_workqueue(wakeup_wq);
+
 	usb_deregister(&xillyusb_driver);
 }
 






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