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authorDan Carpenter <dan.carpenter@oracle.com>2020-01-15 20:49:04 +0300
committerJohan Hedberg <johan.hedberg@intel.com>2020-01-26 10:34:17 +0200
commit11eb85ec42dc8c7a7ec519b90ccf2eeae9409de8 (patch)
treea88ca07a4de1b08600afabe48fb8b92b15b5cc28 /include/net
parentBluetooth: Move {min,max}_key_size debugfs into hci_debugfs_create_le (diff)
downloadlinux-dev-11eb85ec42dc8c7a7ec519b90ccf2eeae9409de8.tar.xz
linux-dev-11eb85ec42dc8c7a7ec519b90ccf2eeae9409de8.zip
Bluetooth: Fix race condition in hci_release_sock()
Syzbot managed to trigger a use after free "KASAN: use-after-free Write in hci_sock_bind". I have reviewed the code manually and one possibly cause I have found is that we are not holding lock_sock(sk) when we do the hci_dev_put(hdev) in hci_sock_release(). My theory is that the bind and the release are racing against each other which results in this use after free. Reported-by: syzbot+eba992608adf3d796bcc@syzkaller.appspotmail.com Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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