On 01.11.2017 18:03, Greg Kroah-Hartman wrote:
On Fri, Sep 29, 2017 at 05:12:47PM +0800, Jeffy Chen wrote:
When the cmd_timer fired, it would try to access the command struct.
So cancel it before cleanup the command queue in xhci_hc_died(), to
avoid use-after-free reported by KASAN:
[ 176.952537] BUG: KASAN: use-after-free in
xhci_handle_command_timeout+0x68/0x224
[ 176.960846] Write of size 4 at addr ffffffc0cbb01608 by task kworker/3:3/1680
...
[ 177.180644] Freed by task 0:
[ 177.183882] kasan_slab_free+0x90/0x15c
[ 177.188194] kfree+0x114/0x28c
[ 177.191630] xhci_cleanup_command_queue+0xc8/0xf8
[ 177.196916] xhci_hc_died+0x84/0x358
Fixes: d9f11ba9f107 ("xhci: Rework how we handle unresponsive or hoptlug removed
hosts")
Signed-off-by: Jeffy Chen <[email protected]>
---
Mathias, did you miss this one? Want me to queue it up?
There is a v2 of that patch already upstreamed.
d1aad52 xhci: Cleanup current_cmd in xhci_cleanup_command_queue()
https://marc.info/?l=linux-usb&m=150668331802206&w=2
A bit confusing as patch subject changed as well in v2
-Mathias
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