diff options
| author | Ziyang Xuan <william.xuanziyang@huawei.com> | 2021-10-16 08:20:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:15:52 +0300 |
| commit | 3cddf1f7f7b5410931c395df4b9aa6d9892c4646 (patch) | |
| tree | 3fd3921e439df0680b6d42d6b6e5cec9a4335d3f /drivers/char | |
| parent | d1c687148ed5bdba086536e99c54e40ec390905d (diff) | |
| download | linux-3cddf1f7f7b5410931c395df4b9aa6d9892c4646.tar.xz | |
char: xillybus: fix msg_ep UAF in xillyusb_probe()
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/xillybus/xillyusb.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/char/xillybus/xillyusb.c b/drivers/char/xillybus/xillyusb.c index e7f88f35c702..dc3551796e5e 100644 --- a/drivers/char/xillybus/xillyusb.c +++ b/drivers/char/xillybus/xillyusb.c @@ -1912,6 +1912,7 @@ static int xillyusb_setup_base_eps(struct xillyusb_dev *xdev) dealloc: endpoint_dealloc(xdev->msg_ep); /* Also frees FIFO mem if allocated */ + xdev->msg_ep = NULL; return -ENOMEM; } |