[PATCH 3.18 06/68] RDS: Fix the atomicity for congestion map update

From: Greg Kroah-Hartman
Date: Fri May 05 2017 - 14:50:28 EST

3.18-stable review patch. If anyone has any objections, please let me know.


From: santosh.shilimkar@xxxxxxxxxx <santosh.shilimkar@xxxxxxxxxx>

commit e47db94e10447fc467777a40302f2b393e9af2fa upstream.

Two different threads with different rds sockets may be in
rds_recv_rcvbuf_delta() via receive path. If their ports
both map to the same word in the congestion map, then
using non-atomic ops to update it could cause the map to
be incorrect. Lets use atomics to avoid such an issue.

Full credit to Wengang <wen.gang.wang@xxxxxxxxxx> for
finding the issue, analysing it and also pointing out
to offending code with spin lock based fix.

Reviewed-by: Leon Romanovsky <leon@xxxxxxx>
Signed-off-by: Wengang Wang <wen.gang.wang@xxxxxxxxxx>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

net/rds/cong.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/rds/cong.c
+++ b/net/rds/cong.c
@@ -285,7 +285,7 @@ void rds_cong_set_bit(struct rds_cong_ma
i = be16_to_cpu(port) / RDS_CONG_MAP_PAGE_BITS;
off = be16_to_cpu(port) % RDS_CONG_MAP_PAGE_BITS;

- __set_bit_le(off, (void *)map->m_page_addrs[i]);
+ set_bit_le(off, (void *)map->m_page_addrs[i]);

void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port)
@@ -299,7 +299,7 @@ void rds_cong_clear_bit(struct rds_cong_
i = be16_to_cpu(port) / RDS_CONG_MAP_PAGE_BITS;
off = be16_to_cpu(port) % RDS_CONG_MAP_PAGE_BITS;

- __clear_bit_le(off, (void *)map->m_page_addrs[i]);
+ clear_bit_le(off, (void *)map->m_page_addrs[i]);

static int rds_cong_test_bit(struct rds_cong_map *map, __be16 port)