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authorSowmini Varadhan <sowmini.varadhan@oracle.com>2018-02-13 09:46:16 -0800
committerDavid S. Miller <davem@davemloft.net>2018-02-13 13:52:02 -0500
commitd4014d8cc6dfa964e3e66df525de2384e3583018 (patch)
tree7571e6aa6e2a1025c33735300cc8dbd3c8996789 /net/rds
parentf7219bf31122e2f70887ed48ba7c4c15dad45da0 (diff)
downloadlinux-d4014d8cc6dfa964e3e66df525de2384e3583018.tar.bz2
rds: do not call ->conn_alloc with GFP_KERNEL
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+a0564419941aaae3fe3c@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.varadhan@oracle.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
-rw-r--r--net/rds/connection.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 94e190febfdd..2da3176bf792 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -224,7 +224,7 @@ static struct rds_connection *__rds_conn_create(struct net *net,
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);