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net: igmp: increase size of mr_ifc_count 

[ Upstream commit b69dd5b3780a7298bd893816a09da751bc0636f7 ]

Some arches support cmpxchg() on 4-byte and 8-byte only.
Increase mr_ifc_count width to 32bit to fix this problem.

Fixes: 4a2b285e7e10 ("net: igmp: fix data-race in igmp_ifc_timer_expire()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210811195715.3684218-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2021-08-11 12:57:15 -07:00 committed by Greg Kroah-Hartman
parent 721ff564cc
commit 4d3c5c319b
2 changed files with 2 additions and 2 deletions
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2
include/linux/inetdevice.h
View File

@ -41,7 +41,7 @@ struct in_device {
unsigned long mr_qri; /* Query Response Interval */
unsigned char mr_qrv; /* Query Robustness Variable */
unsigned char mr_gq_running;
unsigned char mr_ifc_count;
u32 mr_ifc_count;
struct timer_list mr_gq_timer; /* general query timer */
struct timer_list mr_ifc_timer; /* interface change timer */

2
net/ipv4/igmp.c
View File

@ -805,7 +805,7 @@ static void igmp_gq_timer_expire(struct timer_list *t)
static void igmp_ifc_timer_expire(struct timer_list *t)
{
struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
u8 mr_ifc_count;
u32 mr_ifc_count;
igmpv3_send_cr(in_dev);
restart: