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| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-08-19 18:15:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-15 10:50:42 +0300 |
| commit | 50e6f34499a548a9ebe43a36d2c85915e95cc3d8 (patch) | |
| tree | e06085918d28dc99045639448bd0af8f520a06d1 /net/bluetooth | |
| parent | cc59ad70cfb654c6fa3acc07db21d2231c9ffce9 (diff) | |
| download | linux-50e6f34499a548a9ebe43a36d2c85915e95cc3d8.tar.xz | |
Bluetooth: add timeout sanity check to hci_inquiry
[ 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: 1da177e4c3f4 ("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>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/hci_core.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 2f1868e426ab..a9097fb7eb82 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -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) { |