From: Ziyang Xuan william.xuanziyang@huawei.com
[ Upstream commit 515e7184bdf0a3ebf1757cc77fb046b4fe282189 ]
When fail to init coex module, free 'common' and 'adapter' directly, but common->tx_thread which will access 'common' and 'adapter' is running at the same time. That will trigger the UAF bug.
================================================================== BUG: KASAN: use-after-free in rsi_tx_scheduler_thread+0x50f/0x520 [rsi_91x] Read of size 8 at addr ffff8880076dc000 by task Tx-Thread/124777 CPU: 0 PID: 124777 Comm: Tx-Thread Not tainted 5.15.0-rc5+ #19 Call Trace: dump_stack_lvl+0xe2/0x152 print_address_description.constprop.0+0x21/0x140 ? rsi_tx_scheduler_thread+0x50f/0x520 kasan_report.cold+0x7f/0x11b ? rsi_tx_scheduler_thread+0x50f/0x520 rsi_tx_scheduler_thread+0x50f/0x520 ...
Freed by task 111873: kasan_save_stack+0x1b/0x40 kasan_set_track+0x1c/0x30 kasan_set_free_info+0x20/0x30 __kasan_slab_free+0x109/0x140 kfree+0x117/0x4c0 rsi_91x_init+0x741/0x8a0 [rsi_91x] rsi_probe+0x9f/0x1750 [rsi_usb]
Stop thread before free 'common' and 'adapter' to fix it.
Fixes: 2108df3c4b18 ("rsi: add coex support") Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/20211015040335.1021546-1-william.xuanziyang@huawei... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/rsi/rsi_91x_main.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/wireless/rsi/rsi_91x_main.c b/drivers/net/wireless/rsi/rsi_91x_main.c index 143224a3802ba..f1bf71e6c6081 100644 --- a/drivers/net/wireless/rsi/rsi_91x_main.c +++ b/drivers/net/wireless/rsi/rsi_91x_main.c @@ -369,6 +369,7 @@ struct rsi_hw *rsi_91x_init(u16 oper_mode) if (common->coex_mode > 1) { if (rsi_coex_attach(common)) { rsi_dbg(ERR_ZONE, "Failed to init coex module\n"); + rsi_kill_thread(&common->tx_thread); goto err; } }