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Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl 

Needn't call 'rfcomm_dlc_put' here, because 'rfcomm_dlc_exists' didn't
increase dlc->refcnt.

Reported-by: syzbot+4496e82090657320efc6@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Suggested-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Qiujun Huang 2020-03-08 17:45:27 +08:00 committed by Marcel Holtmann
parent 4be5ca67d5
commit 71811cac85
1 changed files with 1 additions and 3 deletions
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4
net/bluetooth/rfcomm/tty.c
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@ -413,10 +413,8 @@ static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel); dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
if (IS_ERR(dlc)) if (IS_ERR(dlc))
return PTR_ERR(dlc); return PTR_ERR(dlc);
else if (dlc) { if (dlc)
rfcomm_dlc_put(dlc);
return -EBUSY; return -EBUSY;
}
dlc = rfcomm_dlc_alloc(GFP_KERNEL); dlc = rfcomm_dlc_alloc(GFP_KERNEL);
if (!dlc) if (!dlc)
return -ENOMEM; return -ENOMEM;