From: Benjamin LaHaise <bcrl@kvack.org>
Date: Sat, 21 Dec 2013 20:49:28 +0000 (-0500)
Subject: aio: fix kioctx leak introduced by "aio: Fix a trinity splat"
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1881686f842065d2f92ec9c6424830ffc17d23b0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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

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>
Cc: stable@vger.kernel.org
---

diff --git a/fs/aio.c b/fs/aio.c
index 6efb7f6cb22e..fd1c0baf15bb 100644
--- 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)