Commit ebeeb1ad9b8a ("rds: tcp: use rds_destroy_pending() to synchronize
netns/module teardown and rds connection/workq management")
adds an rcu read critical section to __rd_conn_create. The
memory allocations in that critcal section need to use
GFP_ATOMIC to avoid sleeping.
This patch was verified with syzkaller reproducer.
Reported-by: syzbot+a0564419941aaae3f...@syzkaller.appspotmail.com
Fixes: ebeeb1ad9b8a ("rds: tcp: use rds_destroy_pending() to synchronize
netns/module teardown and rds connection/workq management")
Signed-off-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilim...@oracle.com>
---
v2: do not over-engineer. Keep the gfp arg to ->conn_alloc simple.
v3: resending since previous attempt did not show up in patch queue.
net/rds/connection.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 94e190f..2da3176 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -224,7 +224,7 @@ static void __rds_conn_path_init(struct rds_connection
*conn,
if (rds_destroy_pending(conn))
ret = -ENETDOWN;
else
- ret = trans->conn_alloc(conn, gfp);
+ ret = trans->conn_alloc(conn, GFP_ATOMIC);
if (ret) {
rcu_read_unlock();
kfree(conn->c_path);
--
1.7.1
