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Bluetooth: add timeout sanity check to hci_inquiry

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[ Upstream commit f41a4b2b5eb7872109723dab8ae1603bdd9d9ec1 ]

Syzbot hit "task hung" bug in hci_req_sync(). The problem was in
unreasonable huge inquiry timeout passed from userspace.
Fix it by adding sanity check for timeout value to hci_inquiry().

Since hci_inquiry() is the only user of hci_req_sync() with user
controlled timeout value, it makes sense to check timeout value in
hci_inquiry() and don't touch hci_req_sync().

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-and-tested-by: syzbot+be2baed593ea56c6a84c@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavel Skripkin 2021-08-19 18:15:21 +03:00 committed by AuxXxilium
parent f2d4d5c9c6
commit 9f919f6ca1
1 changed files with 6 additions and 0 deletions
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6
net/bluetooth/hci_core.c
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@ -1336,6 +1336,12 @@ int hci_inquiry(void __user *arg)
goto done;
}
/* Restrict maximum inquiry length to 60 seconds */
if (ir.length > 60) {
err = -EINVAL;
goto done;
}
hci_dev_lock(hdev);
if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
inquiry_cache_empty(hdev) || ir.flags & IREQ_CACHE_FLUSH) {