From: Roland Dreier <roland@purestorage.com>
Date: Mon, 15 Jan 2018 12:24:49 -0800
Subject: qed: Fix potential use-after-free in qed_spq_post()
Patch-mainline: v4.15-rc9
Git-commit: 70eeff66c4696cee4076d6388b6bede5bd7ff71c
References: bsc#1086314 FATE#324886 bsc#1086313 FATE#324885 bsc#1086301 FATE#3248881

We need to check if p_ent->comp_mode is QED_SPQ_MODE_EBLOCK before
calling qed_spq_add_entry().  The test is fine is the mode is EBLOCK,
but if it isn't then qed_spq_add_entry() might kfree(p_ent).

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/qlogic/qed/qed_spq.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/qlogic/qed/qed_spq.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_spq.c
@@ -776,6 +776,7 @@ int qed_spq_post(struct qed_hwfn *p_hwfn
 	int rc = 0;
 	struct qed_spq *p_spq = p_hwfn ? p_hwfn->p_spq : NULL;
 	bool b_ret_ent = true;
+	bool eblock;
 
 	if (!p_hwfn)
 		return -EINVAL;
@@ -794,6 +795,11 @@ int qed_spq_post(struct qed_hwfn *p_hwfn
 	if (rc)
 		goto spq_post_fail;
 
+	/* Check if entry is in block mode before qed_spq_add_entry,
+	 * which might kfree p_ent.
+	 */
+	eblock = (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK);
+
 	/* Add the request to the pending queue */
 	rc = qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
 	if (rc)
@@ -811,7 +817,7 @@ int qed_spq_post(struct qed_hwfn *p_hwfn
 
 	spin_unlock_bh(&p_spq->lock);
 
-	if (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK) {
+	if (eblock) {
 		/* For entries in QED BLOCK mode, the completion code cannot
 		 * perform the necessary cleanup - if it did, we couldn't
 		 * access p_ent here to see whether it's successful or not.