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Message-Id: <20210120145203.1109140-5-razor@blackwall.org>
Date:   Wed, 20 Jan 2021 16:51:53 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     netdev@...r.kernel.org
Cc:     roopa@...dia.com, bridge@...ts.linux-foundation.org,
        kuba@...nel.org, davem@...emloft.net,
        Nikolay Aleksandrov <nikolay@...dia.com>
Subject: [PATCH net-next 04/14] net: bridge: multicast: calculate idx position without changing ptr

From: Nikolay Aleksandrov <nikolay@...dia.com>

We need to preserve the srcs pointer since we'll be passing it for EHT
handling later.

Signed-off-by: Nikolay Aleksandrov <nikolay@...dia.com>
---
 net/bridge/br_multicast.c | 27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 79569a398669..f8b685ae56d4 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1812,7 +1812,7 @@ static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg, void *h_a
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (!ent) {
 			ent = br_multicast_new_group_src(pg, &src_ip);
@@ -1822,7 +1822,6 @@ static bool br_multicast_isinc_allow(struct net_bridge_port_group *pg, void *h_a
 
 		if (ent)
 			__grp_src_mod_timer(ent, now + br_multicast_gmi(br));
-		srcs += addr_size;
 	}
 
 	return changed;
@@ -1846,7 +1845,7 @@ static void __grp_src_isexc_incl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent)
 			ent->flags &= ~BR_SGRP_F_DELETE;
@@ -1854,7 +1853,6 @@ static void __grp_src_isexc_incl(struct net_bridge_port_group *pg, void *h_addr,
 			ent = br_multicast_new_group_src(pg, &src_ip);
 		if (ent)
 			br_multicast_fwd_src_handle(ent);
-		srcs += addr_size;
 	}
 
 	__grp_src_delete_marked(pg);
@@ -1882,7 +1880,7 @@ static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent) {
 			ent->flags &= ~BR_SGRP_F_DELETE;
@@ -1894,7 +1892,6 @@ static bool __grp_src_isexc_excl(struct net_bridge_port_group *pg, void *h_addr,
 				changed = true;
 			}
 		}
-		srcs += addr_size;
 	}
 
 	if (__grp_src_delete_marked(pg))
@@ -1946,7 +1943,7 @@ static bool __grp_src_toin_incl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent) {
 			ent->flags &= ~BR_SGRP_F_SEND;
@@ -1958,7 +1955,6 @@ static bool __grp_src_toin_incl(struct net_bridge_port_group *pg, void *h_addr,
 		}
 		if (ent)
 			__grp_src_mod_timer(ent, now + br_multicast_gmi(br));
-		srcs += addr_size;
 	}
 
 	if (to_send)
@@ -1989,7 +1985,7 @@ static bool __grp_src_toin_excl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent) {
 			if (timer_pending(&ent->timer)) {
@@ -2003,7 +1999,6 @@ static bool __grp_src_toin_excl(struct net_bridge_port_group *pg, void *h_addr,
 		}
 		if (ent)
 			__grp_src_mod_timer(ent, now + br_multicast_gmi(br));
-		srcs += addr_size;
 	}
 
 	if (to_send)
@@ -2050,7 +2045,7 @@ static void __grp_src_toex_incl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent) {
 			ent->flags = (ent->flags & ~BR_SGRP_F_DELETE) |
@@ -2061,7 +2056,6 @@ static void __grp_src_toex_incl(struct net_bridge_port_group *pg, void *h_addr,
 		}
 		if (ent)
 			br_multicast_fwd_src_handle(ent);
-		srcs += addr_size;
 	}
 
 	__grp_src_delete_marked(pg);
@@ -2090,7 +2084,7 @@ static bool __grp_src_toex_excl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent) {
 			ent->flags &= ~BR_SGRP_F_DELETE;
@@ -2105,7 +2099,6 @@ static bool __grp_src_toex_excl(struct net_bridge_port_group *pg, void *h_addr,
 			ent->flags |= BR_SGRP_F_SEND;
 			to_send++;
 		}
-		srcs += addr_size;
 	}
 
 	if (__grp_src_delete_marked(pg))
@@ -2156,13 +2149,12 @@ static bool __grp_src_block_incl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (ent) {
 			ent->flags |= BR_SGRP_F_SEND;
 			to_send++;
 		}
-		srcs += addr_size;
 	}
 
 	if (to_send)
@@ -2197,7 +2189,7 @@ static bool __grp_src_block_excl(struct net_bridge_port_group *pg, void *h_addr,
 	memset(&src_ip, 0, sizeof(src_ip));
 	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&src_ip.src, srcs, addr_size);
+		memcpy(&src_ip.src, srcs + (src_idx * addr_size), addr_size);
 		ent = br_multicast_find_group_src(pg, &src_ip);
 		if (!ent) {
 			ent = br_multicast_new_group_src(pg, &src_ip);
@@ -2210,7 +2202,6 @@ static bool __grp_src_block_excl(struct net_bridge_port_group *pg, void *h_addr,
 			ent->flags |= BR_SGRP_F_SEND;
 			to_send++;
 		}
-		srcs += addr_size;
 	}
 
 	if (to_send)
-- 
2.29.2

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