OpenWrt – Rev 4
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From ef55290ab88bb9a640bb0ab7213b6827c7207ee6 Mon Sep 17 00:00:00 2001
From: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
Date: Fri, 5 Jan 2018 00:01:30 +0900
Subject: [PATCH 149/454] vcsm: Support for finding user/vc handle in memory
pool
vmcs_sm_{usr,vc}_handle_from_pid_and_address() were failing to find
handle if specified user pointer is not exactly the one that the memory
locking call returned even if the pointer is in range of map/resource.
So fixed the functions to match the range.
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
---
drivers/char/broadcom/vc_sm/vmcs_sm.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/char/broadcom/vc_sm/vmcs_sm.c
+++ b/drivers/char/broadcom/vc_sm/vmcs_sm.c
@@ -276,7 +276,10 @@ static unsigned int vmcs_sm_vc_handle_fr
/* Lookup the resource. */
if (!list_empty(&sm_state->map_list)) {
list_for_each_entry(map, &sm_state->map_list, map_list) {
- if (map->res_pid != pid || map->res_addr != addr)
+ if (map->res_pid != pid)
+ continue;
+ if (!(map->res_addr <= addr &&
+ addr < map->res_addr + map->resource->res_size))
continue;
pr_debug("[%s]: global map %p (pid %u, addr %lx) -> vc-hdl %x (usr-hdl %x)\n",
@@ -326,7 +329,10 @@ static unsigned int vmcs_sm_usr_handle_f
/* Lookup the resource. */
if (!list_empty(&sm_state->map_list)) {
list_for_each_entry(map, &sm_state->map_list, map_list) {
- if (map->res_pid != pid || map->res_addr != addr)
+ if (map->res_pid != pid)
+ continue;
+ if (!(map->res_addr <= addr &&
+ addr < map->res_addr + map->resource->res_size))
continue;
pr_debug("[%s]: global map %p (pid %u, addr %lx) -> usr-hdl %x (vc-hdl %x)\n",