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When the pn532 uart device is detaching, the pn532_uart_remove()
is called. But there are no functions in pn532_uart_remove() that
could delete the cmd_timeout timer, which will cause use-after-free
bugs. The process is shown below:
(thread 1) | (thread 2)
| pn532_uart_send_frame
pn532_uart_remove | mod_timer(&pn532->cmd_timeout,...)
... | (wait a time)
kfree(pn532) //FREE | pn532_cmd_timeout
| pn532_uart_send_frame
| pn532->... //USE
This patch adds del_timer_sync() in pn532_uart_remove() in order to
prevent the use-after-free bugs. What's more, the pn53x_unregister_nfc()
is well synchronized, it sets nfc_dev->shutting_down to true and there
are no syscalls could restart the cmd_timeout timer.
Fixes:
|
||
---|---|---|
.. | ||
fdp | ||
microread | ||
nfcmrvl | ||
nxp-nci | ||
pn533 | ||
pn544 | ||
s3fwrn5 | ||
st21nfca | ||
st95hf | ||
st-nci | ||
Kconfig | ||
Makefile | ||
mei_phy.c | ||
mei_phy.h | ||
nfcsim.c | ||
port100.c | ||
trf7970a.c | ||
virtual_ncidev.c |