aio: fix kioctx leak introduced by "aio: Fix a trinity splat"

commit 1881686f842065d2f92ec9c6424830ffc17d23b0 upstream.

e34ecee2ae791df674dfb466ce40692ca6218e43 reworked the percpu reference
counting to correct a bug trinity found.  Unfortunately, the change lead
to kioctxes being leaked because there was no final reference count to
put.  Add that reference count back in to fix things.

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/aio.c b/fs/aio.c
index 6efb7f6..fd1c0ba 100644 (file)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -652,7 +652,8 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
        aio_nr += ctx->max_reqs;
        spin_unlock(&aio_nr_lock);
 
-       percpu_ref_get(&ctx->users); /* io_setup() will drop this ref */
+       percpu_ref_get(&ctx->users);    /* io_setup() will drop this ref */
+       percpu_ref_get(&ctx->reqs);     /* free_ioctx_users() will drop this */
 
        err = ioctx_add_table(ctx, mm);
        if (err)