tree 22a7070a7d5b13891bc65368b42bcb18cc56d6f1
parent b2b7af861122a0c0f6260155c29a1b2e594cd5b5
author Jakub Audykowicz <jakub.audykowicz@gmail.com> 1543951661 +0100
committer David S. Miller <davem@davemloft.net> 1544071072 -0800

sctp: frag_point sanity check

If for some reason an association's fragmentation point is zero,
sctp_datamsg_from_user will try to endlessly try to divide a message
into zero-sized chunks. This eventually causes kernel panic due to
running out of memory.

Although this situation is quite unlikely, it has occurred before as
reported. I propose to add this simple last-ditch sanity check due to
the severity of the potential consequences.

Signed-off-by: Jakub Audykowicz <jakub.audykowicz@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>