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| author | Shuah Khan <skhan@linuxfoundation.org> | 2021-03-29 19:36:51 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-14 08:42:03 +0200 |
| commit | f06cb4641b15e55c2c7d47c44a57a8c9208b92ef (patch) | |
| tree | 00bde613a0762ed88a803e811c37696db74db399 | |
| parent | 28dc9237fe83602b00d43d40673bbfc1f00d8971 (diff) | |
| download | kernel_replicant_linux-f06cb4641b15e55c2c7d47c44a57a8c9208b92ef.tar.gz kernel_replicant_linux-f06cb4641b15e55c2c7d47c44a57a8c9208b92ef.tar.bz2 kernel_replicant_linux-f06cb4641b15e55c2c7d47c44a57a8c9208b92ef.zip | |
usbip: synchronize event handler with sysfs code paths
commit 363eaa3a450abb4e63bd6e3ad79d1f7a0f717814 upstream.
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>
| -rw-r--r-- | drivers/usb/usbip/usbip_event.c | 2 |
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); } |