linux-kernel - [PATCH] staging: gasket: interrupt: fix the missed eventfd_ctx_put() in gasket

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Message-ID: <20201112064924.99680-1-jingxiangfeng@huawei.com>
Date:   Thu, 12 Nov 2020 14:49:24 +0800
From:   Jing Xiangfeng <jingxiangfeng@...wei.com>
To:     <rspringer@...gle.com>, <toddpoynor@...gle.com>,
        <benchan@...omium.org>, <rcy@...gle.com>,
        <gregkh@...uxfoundation.org>, <sque@...omium.org>,
        <jnjoseph@...gle.com>
CC:     <devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
        <jingxiangfeng@...wei.com>
Subject: [PATCH] staging: gasket: interrupt: fix the missed eventfd_ctx_put() in gasket_interrupt.c

gasket_interrupt_set_eventfd() misses to call eventfd_ctx_put() in an
error path. We check interrupt is valid before calling
eventfd_ctx_fdget() to fix it.

There is the same issue in gasket_interrupt_clear_eventfd(), Add the
missed function call to fix it.

Fixes: 9a69f5087ccc ("drivers/staging: Gasket driver framework + Apex driver")
Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
---
 drivers/staging/gasket/gasket_interrupt.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/gasket/gasket_interrupt.c b/drivers/staging/gasket/gasket_interrupt.c
index 2d6195f7300e..864342acfd86 100644
--- a/drivers/staging/gasket/gasket_interrupt.c
+++ b/drivers/staging/gasket/gasket_interrupt.c
@@ -487,14 +487,16 @@ int gasket_interrupt_system_status(struct gasket_dev *gasket_dev)
 int gasket_interrupt_set_eventfd(struct gasket_interrupt_data *interrupt_data,
 				 int interrupt, int event_fd)
 {
-	struct eventfd_ctx *ctx = eventfd_ctx_fdget(event_fd);
-
-	if (IS_ERR(ctx))
-		return PTR_ERR(ctx);
+	struct eventfd_ctx *ctx;
 
 	if (interrupt < 0 || interrupt >= interrupt_data->num_interrupts)
 		return -EINVAL;
 
+	ctx = eventfd_ctx_fdget(event_fd);
+
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
 	interrupt_data->eventfd_ctxs[interrupt] = ctx;
 	return 0;
 }
@@ -505,6 +507,9 @@ int gasket_interrupt_clear_eventfd(struct gasket_interrupt_data *interrupt_data,
 	if (interrupt < 0 || interrupt >= interrupt_data->num_interrupts)
 		return -EINVAL;
 
-	interrupt_data->eventfd_ctxs[interrupt] = NULL;
+	if (interrupt_data->eventfd_ctxs[interrupt]) {
+		eventfd_ctx_put(interrupt_data->eventfd_ctxs[interrupt]);
+		interrupt_data->eventfd_ctxs[interrupt] = NULL;
+	}
 	return 0;
 }
-- 
2.17.1