kernel/sys.c: fix potential Spectre v1 issue

[sfrench/cifs-2.6.git] / fs / aio.c

diff --git a/fs/aio.c b/fs/aio.c
index 88d7927ffbc61910c8c47948157fccfa8e6f10ed..8061d9787e547d305ea6953a092d61df933b332a 100644 (file)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1078,8 +1078,8 @@ static struct kioctx *lookup_ioctx(unsigned long ctx_id)
 
        ctx = rcu_dereference(table->table[id]);
        if (ctx && ctx->user_id == ctx_id) {
-               percpu_ref_get(&ctx->users);
-               ret = ctx;
+               if (percpu_ref_tryget_live(&ctx->users))
+                       ret = ctx;
        }
 out:
        rcu_read_unlock();