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strparser: Use delayed work instead of timer for msg timeout 

Sock lock may be taken in the message timer function which is a
problem since timers run in BH. Instead of timers use delayed_work.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Fixes: bbb03029a8 ("strparser: Generalize strparser")
Signed-off-by: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Tom Herbert 2017-10-20 16:40:43 -07:00 committed by David S. Miller
parent 864f5af3a3
commit 829385f08a
2 changed files with 9 additions and 11 deletions
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3
include/net/strparser.h
View File

@ -74,10 +74,9 @@ struct strparser {
u32 unrecov_intr : 1;
struct sk_buff **skb_nextp;
struct timer_list msg_timer;
struct sk_buff *skb_head;
unsigned int need_bytes;
struct delayed_work delayed_work;
struct delayed_work msg_timer_work;
struct work_struct work;
struct strp_stats stats;
struct strp_callbacks cb;

17
net/strparser/strparser.c
View File

@ -49,7 +49,7 @@ static void strp_abort_strp(struct strparser *strp, int err)
{
/* Unrecoverable error in receive */
del_timer(&strp->msg_timer);
cancel_delayed_work(&strp->msg_timer_work);
if (strp->stopped)
return;
@ -68,7 +68,7 @@ static void strp_abort_strp(struct strparser *strp, int err)
static void strp_start_timer(struct strparser *strp, long timeo)
{
if (timeo)
mod_timer(&strp->msg_timer, timeo);
mod_delayed_work(strp_wq, &strp->msg_timer_work, timeo);
}
/* Lower lock held */
@ -319,7 +319,7 @@ static int __strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
eaten += (cand_len - extra);
/* Hurray, we have a new message! */
del_timer(&strp->msg_timer);
cancel_delayed_work(&strp->msg_timer_work);
strp->skb_head = NULL;
STRP_STATS_INCR(strp->stats.msgs);
@ -450,9 +450,10 @@ static void strp_work(struct work_struct *w)
do_strp_work(container_of(w, struct strparser, work));
}
static void strp_msg_timeout(unsigned long arg)
static void strp_msg_timeout(struct work_struct *w)
{
struct strparser *strp = (struct strparser *)arg;
struct strparser *strp = container_of(w, struct strparser,
msg_timer_work.work);
/* Message assembly timed out */
STRP_STATS_INCR(strp->stats.msg_timeouts);
@ -505,9 +506,7 @@ int strp_init(struct strparser *strp, struct sock *sk,
strp->cb.read_sock_done = cb->read_sock_done ? : default_read_sock_done;
strp->cb.abort_parser = cb->abort_parser ? : strp_abort_strp;
setup_timer(&strp->msg_timer, strp_msg_timeout,
(unsigned long)strp);
INIT_DELAYED_WORK(&strp->msg_timer_work, strp_msg_timeout);
INIT_WORK(&strp->work, strp_work);
return 0;
@ -532,7 +531,7 @@ void strp_done(struct strparser *strp)
{
WARN_ON(!strp->stopped);
del_timer_sync(&strp->msg_timer);
cancel_delayed_work_sync(&strp->msg_timer_work);
cancel_work_sync(&strp->work);
if (strp->skb_head) {