netdev - Regarding possible bug in net/wan/x25

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Date:   Sun, 23 Aug 2020 20:58:33 +0530
From:   Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, xie.he.0141@...il.com
Cc:     andrianov <andrianov@...ras.ru>, netdev <netdev@...r.kernel.org>
Subject: Regarding possible bug in net/wan/x25_asy.c

Hello,

I have the following doubt:

sl->xhead is modified in both x25_asy_change_mtu() and
x25_asy_write_wakeup(). However, sl->lock is not held in
x25_asy_write_wakeup(). So, I am not sure if it is indeed possible to
have a race between these two functions. If it is possible that these
two functions can execute in parallel then the lock should be held in
x25_asy_write_wakeup() as well. Please let me know if this race is
possible.

Thanks and regards,
Madhuparna