[PATCH 4/7] module: take rcu_read_lock_sched in module_kallsyms_on_each_symbol()

[Cong Wang]

module_kallsyms_on_each_symbol() should iterate the module list
with list_for_each_entry_rcu() after holding rcu_read_lock_sched().

Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
---
 kernel/module.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index f210d74..73e1f95 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3271,14 +3271,18 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 	unsigned int i;
 	int ret;
 
-	list_for_each_entry(mod, &modules, list) {
+	rcu_read_lock_sched();
+	list_for_each_entry_rcu(mod, &modules, list) {
 		for (i = 0; i < mod->num_symtab; i++) {
 			ret = fn(data, mod->strtab + mod->symtab[i].st_name,
 				 mod, mod->symtab[i].st_value);
-			if (ret != 0)
+			if (ret != 0) {
+				rcu_read_unlock_sched();
 				return ret;
+			}
 		}
 	}
+	rcu_read_unlock_sched();
 	return 0;
 }
 #endif /* CONFIG_KALLSYMS */
-- 
1.7.7.6

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