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authorShuah Khan <skhan@linuxfoundation.org>2021-03-30 04:36:51 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-05 10:05:42 +0300
commit363eaa3a450abb4e63bd6e3ad79d1f7a0f717814 (patch)
treebfefeb5a04b0982e41c3c8aa9893a130cf4f5025 /drivers/usb/usbip
parentbd8b82042269a95db48074b8bb400678dbac1815 (diff)
downloadlinux-363eaa3a450abb4e63bd6e3ad79d1f7a0f717814.tar.xz
usbip: synchronize event handler with sysfs code paths
Fuzzing uncovered race condition between sysfs code paths in usbip drivers. Device connect/disconnect code paths initiated through sysfs interface are prone to races if disconnect happens during connect and vice versa. Use sysfs_lock to synchronize event handler with sysfs paths in usbip drivers. Cc: stable@vger.kernel.org Reported-and-tested-by: syzbot+a93fba6d384346a761e3@syzkaller.appspotmail.com Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> Link: https://lore.kernel.org/r/c5c8723d3f29dfe3d759cfaafa7dd16b0dfe2918.1616807117.git.skhan@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/usbip')
-rw-r--r--drivers/usb/usbip/usbip_event.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/usbip/usbip_event.c b/drivers/usb/usbip/usbip_event.c
index 5d88917c9631..086ca76dd053 100644
--- a/drivers/usb/usbip/usbip_event.c
+++ b/drivers/usb/usbip/usbip_event.c
@@ -70,6 +70,7 @@ static void event_handler(struct work_struct *work)
while ((ud = get_event()) != NULL) {
usbip_dbg_eh("pending event %lx\n", ud->event);
+ mutex_lock(&ud->sysfs_lock);
/*
* NOTE: shutdown must come first.
* Shutdown the device.
@@ -90,6 +91,7 @@ static void event_handler(struct work_struct *work)
ud->eh_ops.unusable(ud);
unset_event(ud, USBIP_EH_UNUSABLE);
}
+ mutex_unlock(&ud->sysfs_lock);
wake_up(&ud->eh_waitq);
}