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authorSagi Grimberg <sagig@mellanox.com>2014-12-02 16:57:34 +0200
committerLuis Henriques <luis.henriques@canonical.com>2015-01-15 10:44:30 +0000
commitc52c1599784cd8e7b6bfa5de82a1aaf1cbfdc424 (patch)
tree897294b1d45af811308d006cbce1cc105c64328e /drivers
parent2a9a256db23b7fb3be06fd44e2506acc911756ae (diff)
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iser-target: Fix NULL dereference in SW mode DIF
commit 302cc7c3ca14d21ccdffdebdb61c4fe028f2d5ad upstream. Fallback to software mode DIF if HCA does not support PI (without crashing obviously). It is still possible to run with backend protection and an unprotected frontend, so looking at the command prot_op is not enough. Check device PI capability on a per-IO basis (isert_prot_cmd inline static) to determine if we need to handle protection information. Trace: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: [<ffffffffa037f8b1>] isert_reg_sig_mr+0x351/0x3b0 [ib_isert] Call Trace: [<ffffffff812b003a>] ? swiotlb_map_sg_attrs+0x7a/0x130 [<ffffffffa038184d>] isert_reg_rdma+0x2fd/0x370 [ib_isert] [<ffffffff8108f2ec>] ? idle_balance+0x6c/0x2c0 [<ffffffffa0382b68>] isert_put_datain+0x68/0x210 [ib_isert] [<ffffffffa02acf5b>] lio_queue_data_in+0x2b/0x30 [iscsi_target_mod] [<ffffffffa02306eb>] target_complete_ok_work+0x21b/0x310 [target_core_mod] [<ffffffff8106ece2>] process_one_work+0x182/0x3b0 [<ffffffff8106fda0>] worker_thread+0x120/0x3c0 [<ffffffff8106fc80>] ? maybe_create_worker+0x190/0x190 [<ffffffff8107594e>] kthread+0xce/0xf0 [<ffffffff81075880>] ? kthread_freezable_should_stop+0x70/0x70 [<ffffffff8159a22c>] ret_from_fork+0x7c/0xb0 [<ffffffff81075880>] ? kthread_freezable_should_stop+0x70/0x70 Reported-by: Slava Shwartsman <valyushash@gmail.com> Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/infiniband/ulp/isert/ib_isert.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 703c957683b1..8a25ebee717a 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -61,6 +61,14 @@ static int
isert_rdma_accept(struct isert_conn *isert_conn);
struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
+static inline bool
+isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
+{
+ return (conn->conn_device->pi_capable &&
+ cmd->prot_op != TARGET_PROT_NORMAL);
+}
+
+
static void
isert_qp_event_callback(struct ib_event *e, void *context)
{
@@ -2930,8 +2938,7 @@ isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
if (ret)
return ret;
- if (wr->data.dma_nents != 1 ||
- se_cmd->prot_op != TARGET_PROT_NORMAL) {
+ if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
spin_lock_irqsave(&isert_conn->conn_lock, flags);
fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
struct fast_reg_descriptor, list);
@@ -2945,7 +2952,7 @@ isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
if (ret)
goto unmap_cmd;
- if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
+ if (isert_prot_cmd(isert_conn, se_cmd)) {
ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
if (ret)
goto unmap_cmd;
@@ -2970,7 +2977,7 @@ isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
send_wr->opcode = IB_WR_RDMA_WRITE;
send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
send_wr->wr.rdma.rkey = isert_cmd->read_stag;
- send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
+ send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
0 : IB_SEND_SIGNALED;
} else {
send_wr->opcode = IB_WR_RDMA_READ;
@@ -3012,7 +3019,7 @@ isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
return rc;
}
- if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
+ if (!isert_prot_cmd(isert_conn, se_cmd)) {
/*
* Build isert_conn->tx_desc for iSCSI response PDU and attach
*/
@@ -3035,7 +3042,7 @@ isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
}
- if (se_cmd->prot_op == TARGET_PROT_NORMAL)
+ if (!isert_prot_cmd(isert_conn, se_cmd))
pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
"READ\n", isert_cmd);
else