Messages in this thread Patch in this message | | | From | Duoming Zhou <> | Subject | [PATCH] atm: idt77252: fix use-after-free bugs caused by tst_timer | Date | Fri, 5 Aug 2022 15:00:08 +0800 |
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There are use-after-free bugs caused by tst_timer. The root cause is that there are no functions to stop tst_timer in idt77252_exit(). One of the possible race conditions is shown below:
(thread 1) | (thread 2) | idt77252_init_one | init_card | fill_tst | mod_timer(&card->tst_timer, ...) idt77252_exit | (wait a time) | tst_timer | | ... kfree(card) // FREE | | card->soft_tst[e] // USE
The idt77252_dev is deallocated in idt77252_exit() and used in timer handler.
This patch adds del_timer_sync() in idt77252_exit() in order that the timer handler could be stopped before the idt77252_dev is deallocated.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> --- drivers/atm/idt77252.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c index 81ce81a75fc..681cb378679 100644 --- a/drivers/atm/idt77252.c +++ b/drivers/atm/idt77252.c @@ -3752,6 +3752,7 @@ static void __exit idt77252_exit(void) card = idt77252_chain; dev = card->atmdev; idt77252_chain = card->next; + del_timer_sync(&card->tst_timer); if (dev->phy->stop) dev->phy->stop(dev); -- 2.17.1
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