diff options
| author | shamir rabinovitch <shamir.rabinovitch@oracle.com> | 2018-12-16 08:01:09 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-19 19:27:58 +0100 |
| commit | c75ab8a55ac1083c232e4407f52b0cadae6c1e0e (patch) | |
| tree | e83b619d72b6c229928260b1a9644c79ba08dda5 /net/rds/rdma.c | |
| parent | net/rds: fix warn in rds_message_alloc_sgs (diff) | |
| download | linux-c75ab8a55ac1083c232e4407f52b0cadae6c1e0e.tar.xz linux-c75ab8a55ac1083c232e4407f52b0cadae6c1e0e.zip | |
net/rds: remove user triggered WARN_ON in rds_sendmsg
per comment from Leon in rdma mailing list
https://lkml.org/lkml/2018/10/31/312 :
Please don't forget to remove user triggered WARN_ON.
https://lwn.net/Articles/769365/
"Greg Kroah-Hartman raised the problem of core kernel API code that will
use WARN_ON_ONCE() to complain about bad usage; that will not generate
the desired result if WARN_ON_ONCE() is configured to crash the machine.
He was told that the code should just call pr_warn() instead, and that
the called function should return an error in such situations. It was
generally agreed that any WARN_ON() or WARN_ON_ONCE() calls that can be
triggered from user space need to be fixed."
in addition harden rds_sendmsg to detect and overcome issues with
invalid sg count and fail the sendmsg.
Suggested-by: Leon Romanovsky <leon@kernel.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: shamir rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/rdma.c')
| -rw-r--r-- | net/rds/rdma.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/net/rds/rdma.c b/net/rds/rdma.c index e1965d9cbcf8..182ab8430594 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -623,11 +623,9 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, op->op_active = 1; op->op_recverr = rs->rs_recverr; WARN_ON(!nr_pages); - op->op_sg = rds_message_alloc_sgs(rm, nr_pages); - if (!op->op_sg) { - ret = -ENOMEM; + op->op_sg = rds_message_alloc_sgs(rm, nr_pages, &ret); + if (!op->op_sg) goto out_pages; - } if (op->op_notify || op->op_recverr) { /* We allocate an uninitialized notifier here, because @@ -839,11 +837,9 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, rm->atomic.op_silent = !!(args->flags & RDS_RDMA_SILENT); rm->atomic.op_active = 1; rm->atomic.op_recverr = rs->rs_recverr; - rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1); - if (!rm->atomic.op_sg) { - ret = -ENOMEM; + rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1, &ret); + if (!rm->atomic.op_sg) goto err; - } /* verify 8 byte-aligned */ if (args->local_addr & 0x7) { |