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However, vub300_disconnect() sets vub300->interface = NULL and drops the driver's kref without shutting down the timer via timer_shutdown_sync(). If the timer expires after the host is removed and vub300 is freed, or if concurrent work items re-arm the timer, vub300_inactivity_timer_expired() accesses the already freed vub300 structure, causing a Use-After-Free. Fix this by explicitly shutting down inactivity_timer via timer_shutdown_sync() and releasing the timer's kref reference in vub300_disconnect() and probe error cleanup paths. Fixes: 88095e7b473a ("mmc: Add new VUB300 USB-to-SD/SDIO/MMC driver") Signed-off-by: Muhammad Bilal --- drivers/mmc/host/vub300.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/vub300.c b/drivers/mmc/host/vub300.c index 8e45dc1a4a12..9f84bd1531e2 100644 --- a/drivers/mmc/host/vub300.c +++ b/drivers/mmc/host/vub300.c @@ -2350,6 +2350,8 @@ static int vub300_probe(struct usb_interface *interface, err_stop_io: vub300->interface = NULL; + timer_shutdown_sync(&vub300->inactivity_timer); + kref_put(&vub300->kref, vub300_delete); kref_put(&vub300->kref, vub300_delete); return retval; @@ -2385,6 +2387,8 @@ static void vub300_disconnect(struct usb_interface *interface) usb_set_intfdata(interface, NULL); /* prevent more I/O from starting */ vub300->interface = NULL; + timer_shutdown_sync(&vub300->inactivity_timer); + kref_put(&vub300->kref, vub300_delete); mmc_remove_host(mmc); kref_put(&vub300->kref, vub300_delete); pr_info("USB vub300 remote SDIO host controller[%d]" -- 2.43.0