In drivers/usb/serial/garmin_gps.c, the functions garmin_read_bulk_callback() and garmin_write_bulk_callback() may be concurrently executed.
In garmin_write_bulk_callback() on line 969:
kfree(urb->transfer_buffer);
In garmin_read_bulk_callback() on line 1165:
unsigned char *data = urb->transfer_buffer;
Thus, a concurrency use-after-free bug may occur.
This possible bug is found by a static analysis tool written by myself.
Best wishes,
Jia-Ju Bai
