From: Raju Rangoju <rajur@chelsio.com>
Date: Wed, 19 May 2021 16:48:31 +0530
Subject: cxgb4: avoid accessing registers when clearing filters
Patch-mainline: v5.13-rc4
Git-commit: 88c380df84fbd03f9b137c2b9d0a44b9f2f553b0
References: bsc#1136345 jsc#SLE-4681

Hardware register having the server TID base can contain
invalid values when adapter is in bad state (for example,
due to AER fatal error). Reading these invalid values in the
register can lead to out-of-bound memory access. So, fix
by using the saved server TID base when clearing filters.

Fixes: b1a79360ee86 ("cxgb4: Delete all hash and TCAM filters before resource cleanup")
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -773,7 +773,7 @@ void clear_all_filters(struct adapter *a
 				cxgb4_del_filter(dev, i, &f->fs);
 		}
 
-		sb = t4_read_reg(adapter, LE_DB_SRVR_START_INDEX_A);
+		sb = adapter->tids.stid_base;
 		for (i = 0; i < sb; i++) {
 			f = (struct filter_entry *)adapter->tids.tid_tab[i];