[PATCH 5.15 017/917] char: xillybus: fix msg_ep UAF in xillyusb_probe()

Greg Kroah-Hartman
2021-11-16T01:14:56Z

From: Ziyang Xuan <william.xuanziyang@huawei.com>

commit 15c9a359094ec6251578b02387436bc64f11a477 upstream.

When endpoint_alloc() return failed in xillyusb_setup_base_eps(),
'xdev->msg_ep' will be freed but not set to NULL. That lets program
enter fail handling to cleanup_dev() in xillyusb_probe(). Check for
'xdev->msg_ep' is invalid in cleanup_dev() because 'xdev->msg_ep' did
not set to NULL when was freed. So the UAF problem for 'xdev->msg_ep'
is triggered.

==================================================================
BUG: KASAN: use-after-free in fifo_mem_release+0x1f4/0x210
CPU: 0 PID: 166 Comm: kworker/0:2 Not tainted 5.15.0-rc5+ #19
Call Trace:
dump_stack_lvl+0xe2/0x152
print_address_description.constprop.0+0x21/0x140
? fifo_mem_release+0x1f4/0x210
kasan_report.cold+0x7f/0x11b
? xillyusb_probe+0x530/0x700
? fifo_mem_release+0x1f4/0x210
fifo_mem_release+0x1f4/0x210
? __sanitizer_cov_trace_pc+0x1d/0x50
endpoint_dealloc+0x35/0x2b0
cleanup_dev+0x90/0x120
xillyusb_probe+0x59a/0x700
...

Freed by task 166:
kasan_save_stack+0x1b/0x40
kasan_set_track+0x1c/0x30
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0x109/0x140
kfree+0x117/0x4c0
xillyusb_probe+0x606/0x700

Set 'xdev->msg_ep' to NULL after being freed in xillyusb_setup_base_eps()
to fix the UAF problem.

Fixes: a53d1202aef1 ("char: xillybus: Add driver for XillyUSB (Xillybus variant for USB)")
Cc: stable <stable@vger.kernel.org>
Acked-by: Eli Billauer <eli.billauer@gmail.com>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Link: https://lore.kernel.org/r/20211016052047.1611983-1-william.xuanziyang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/char/xillybus/xillyusb.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/char/xillybus/xillyusb.c
+++ b/drivers/char/xillybus/xillyusb.c
@@ -1912,6 +1912,7 @@ static int xillyusb_setup_base_eps(struc

dealloc:
endpoint_dealloc(xdev->msg_ep); /* Also frees FIFO mem if allocated */
+ xdev->msg_ep = NULL;
return -ENOMEM;
}