Re: [PATCH net] sctp: fix the issue that a __u16 variable may overflow in sctp_ulpq_renege

From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 18 Dec 2017 14:07:25 +0800

Now when reneging events in sctp_ulpq_renege(), the variable freed
could be increased by a __u16 value twice while freed is of __u16
type. It means freed may overflow at the second addition.

This patch is to fix it by using __u32 type for 'freed', while at
it, also to remove 'if (chunk)' check, as all renege commands are
generated in sctp_eat_data and it can't be NULL.

Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>

Applied.