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| author | Duoming Zhou <duoming@zju.edu.cn> | 2022-08-05 09:00:08 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-08-09 05:51:59 +0200 |
| commit | 3f4093e2bf4673f218c0bf17d8362337c400e77b (patch) | |
| tree | b8401e7acce01f755568d76eb4242bb6c9fed524 /net | |
| parent | net: dsa: felix: fix min gate len calculation for tc when its first gate is c... (diff) | |
| download | linux-3f4093e2bf4673f218c0bf17d8362337c400e77b.tar.xz linux-3f4093e2bf4673f218c0bf17d8362337c400e77b.zip | |
atm: idt77252: fix use-after-free bugs caused by tst_timer
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>
Link: https://lore.kernel.org/r/20220805070008.18007-1-duoming@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions