From: Atul Gupta <atul.gupta@chelsio.com>
Date: Thu, 2 May 2019 03:46:55 -0700
Subject: crypto: chelsio - Fix NULL pointer dereference
Patch-mainline: v5.2-rc1
Git-commit: b4f91664307d5bf4f0d93da12a6146f9cf3559fb
References: bsc#1136353 jsc#SLE-4688

Do not request FW to generate cidx update if there is less
space in tx queue to post new request.
SGE DBP 1 pidx increment too large
BUG: unable to handle kernel NULL pointer dereference at
0000000000000124
SGE error for queue 101

Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/crypto/chelsio/chcr_ipsec.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/crypto/chelsio/chcr_ipsec.c
+++ b/drivers/crypto/chelsio/chcr_ipsec.c
@@ -575,7 +575,8 @@ inline void *chcr_crypto_wreq(struct sk_
 	if (unlikely(credits < ETHTXQ_STOP_THRES)) {
 		netif_tx_stop_queue(q->txq);
 		q->q.stops++;
-		wr_mid |= FW_WR_EQUEQ_F | FW_WR_EQUIQ_F;
+		if (!q->dbqt)
+			wr_mid |= FW_WR_EQUEQ_F | FW_WR_EQUIQ_F;
 	}
 	wr_mid |= FW_ULPTX_WR_DATA_F;
 	wr->wreq.flowid_len16 = htonl(wr_mid);