linux-kernel - [PATCH] goldfish_pipe: allocate memory with GFP

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Message-Id: <1497050306-7064-1-git-send-email-khoroshilov@ispras.ru>
Date:   Sat, 10 Jun 2017 02:18:26 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yurii Zubrytskyi <zyy@...gle.com>,
        Jin Qian <jinqian@...roid.com>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] goldfish_pipe: allocate memory with GFP_ATOMIC in spinlock context

get_free_pipe_id_locked() is called with spinlock held, so
the patch replaces GFP_KERNEL with GFP_ATOMIC to avoid
sleeping in atomic spinlock context.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/platform/goldfish/goldfish_pipe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index 2de1e603bd2b..5f3672153b12 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -704,7 +704,7 @@ static int get_free_pipe_id_locked(struct goldfish_pipe_dev *dev)
 		/* Reallocate the array */
 		u32 new_capacity = 2 * dev->pipes_capacity;
 		struct goldfish_pipe **pipes =
-			kcalloc(new_capacity, sizeof(*pipes), GFP_KERNEL);
+			kcalloc(new_capacity, sizeof(*pipes), GFP_ATOMIC);
 		if (!pipes)
 			return -ENOMEM;
 		memcpy(pipes, dev->pipes, sizeof(*pipes) * dev->pipes_capacity);
-- 
2.7.4