Re: [PATCH] isdn: i4l: isdn_tty: Fix some concurrency double-free bugs

From: Jia-Ju Bai Date: Tue, 8 Jan 2019 21:04:48 +0800 > The functions isdn_tty_tiocmset() and isdn_tty_set_termios() may be > concurrently executed. ... > These possible bugs are found by a static tool written by myself and > my manual code review. > > To fix these possible bugs, the mutex

[PATCH] isdn: i4l: isdn_tty: Fix some concurrency double-free bugs

The functions isdn_tty_tiocmset() and isdn_tty_set_termios() may be concurrently executed. isdn_tty_tiocmset isdn_tty_modem_hup line 719: kfree(info->dtmf_state); line 721: kfree(info->silence_state); line 723: kfree(info->adpcms); line 725: kfree(info->adpcmr);