From da4ed55165d41b1073f9a476f1c18493e9bf8c8e Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Tue, 17 May 2016 18:58:08 +0200 Subject: [PATCH] switchdev: pass pointer to fib_info instead of copy The problem is that fib_info->nh is [0] so the struct fib_info allocation size depends on number of nexthops. If we just copy fib_info, we do not copy the nexthops info and driver accesses memory which is not ours. Given the fact that fib4 does not defer operations and therefore it does not need copy, just pass the pointer down to drivers as it was done before. Fixes: 850d0cbc91 ("switchdev: remove pointers from switchdev objects") Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/ethernet/rocker/rocker_ofdpa.c | 4 ++-- include/net/switchdev.h | 2 +- net/switchdev/switchdev.c | 6 ++---- 3 files changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/rocker/rocker_ofdpa.c b/drivers/net/ethernet/rocker/rocker_ofdpa.c index 0e758bcb26b0..1ca796316173 100644 --- a/drivers/net/ethernet/rocker/rocker_ofdpa.c +++ b/drivers/net/ethernet/rocker/rocker_ofdpa.c @@ -2727,7 +2727,7 @@ static int ofdpa_port_obj_fib4_add(struct rocker_port *rocker_port, return ofdpa_port_fib_ipv4(ofdpa_port, trans, htonl(fib4->dst), fib4->dst_len, - &fib4->fi, fib4->tb_id, 0); + fib4->fi, fib4->tb_id, 0); } static int ofdpa_port_obj_fib4_del(struct rocker_port *rocker_port, @@ -2737,7 +2737,7 @@ static int ofdpa_port_obj_fib4_del(struct rocker_port *rocker_port, return ofdpa_port_fib_ipv4(ofdpa_port, NULL, htonl(fib4->dst), fib4->dst_len, - &fib4->fi, fib4->tb_id, + fib4->fi, fib4->tb_id, OFDPA_OP_FLAG_REMOVE); } diff --git a/include/net/switchdev.h b/include/net/switchdev.h index 51d77b2ce2b2..985619a59323 100644 --- a/include/net/switchdev.h +++ b/include/net/switchdev.h @@ -97,7 +97,7 @@ struct switchdev_obj_ipv4_fib { struct switchdev_obj obj; u32 dst; int dst_len; - struct fib_info fi; + struct fib_info *fi; u8 tos; u8 type; u32 nlflags; diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c index b7e01d88bdc5..59658b2e9cdf 100644 --- a/net/switchdev/switchdev.c +++ b/net/switchdev/switchdev.c @@ -1188,6 +1188,7 @@ int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi, .obj.id = SWITCHDEV_OBJ_ID_IPV4_FIB, .dst = dst, .dst_len = dst_len, + .fi = fi, .tos = tos, .type = type, .nlflags = nlflags, @@ -1196,8 +1197,6 @@ int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi, struct net_device *dev; int err = 0; - memcpy(&ipv4_fib.fi, fi, sizeof(ipv4_fib.fi)); - /* Don't offload route if using custom ip rules or if * IPv4 FIB offloading has been disabled completely. */ @@ -1242,6 +1241,7 @@ int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi, .obj.id = SWITCHDEV_OBJ_ID_IPV4_FIB, .dst = dst, .dst_len = dst_len, + .fi = fi, .tos = tos, .type = type, .nlflags = 0, @@ -1250,8 +1250,6 @@ int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi, struct net_device *dev; int err = 0; - memcpy(&ipv4_fib.fi, fi, sizeof(ipv4_fib.fi)); - if (!(fi->fib_flags & RTNH_F_OFFLOAD)) return 0; -- 2.20.1