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Date: Fri, 27 Apr 2018 15:58:22 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Tejun Heo <tj@...nel.org>, Doron Roberts-Kedes <doronrk@...com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.14 29/80] strparser: Do not call mod_delayed_work with a timeout of LONG_MAX 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Doron Roberts-Kedes <doronrk@...com> [ Upstream commit 7c5aba211dd61f41d737a2c51729eb9fdcd3edf4 ] struct sock's sk_rcvtimeo is initialized to LONG_MAX/MAX_SCHEDULE_TIMEOUT in sock_init_data. Calling mod_delayed_work with a timeout of LONG_MAX causes spurious execution of the work function. timer->expires is set equal to jiffies + LONG_MAX. When timer_base->clk falls behind the current value of jiffies, the delta between timer_base->clk and jiffies + LONG_MAX causes the expiration to be in the past. Returning early from strp_start_timer if timeo == LONG_MAX solves this problem. Found while testing net/tls_sw recv path. Fixes: 43a0c6751a322847 ("strparser: Stream parser for messages") Reviewed-by: Tejun Heo <tj@...nel.org> Signed-off-by: Doron Roberts-Kedes <doronrk@...com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/strparser/strparser.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/strparser/strparser.c +++ b/net/strparser/strparser.c @@ -67,7 +67,7 @@ static void strp_abort_strp(struct strpa static void strp_start_timer(struct strparser *strp, long timeo) { - if (timeo) + if (timeo && timeo != LONG_MAX) mod_delayed_work(strp_wq, &strp->msg_timer_work, timeo); }
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