From 579ba855524c49d30929871b63c1f7637ffab4b6 Mon Sep 17 00:00:00 2001 From: shamir rabinovitch Date: Thu, 7 Apr 2016 07:57:36 -0400 Subject: [PATCH] RDS: fix congestion map corruption for PAGE_SIZE > 4k When PAGE_SIZE > 4k single page can contain 2 RDS fragments. If 'rds_ib_cong_recv' ignore the RDS fragment offset in to the page it then read the data fragment as far congestion map update and lead to corruption of the RDS connection far congestion map. Signed-off-by: Shamir Rabinovitch Signed-off-by: David S. Miller --- net/rds/ib_recv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 977fb86..abc8cc8 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -796,7 +796,7 @@ static void rds_ib_cong_recv(struct rds_connection *conn, addr = kmap_atomic(sg_page(&frag->f_sg)); - src = addr + frag_off; + src = addr + frag->f_sg.offset + frag_off; dst = (void *)map->m_page_addrs[map_page] + map_off; for (k = 0; k < to_copy; k += 8) { /* Record ports that became uncongested, ie -- 2.7.4