linux-kernel - [PATCH][next] dma-buf: fix resource leak on -ENOTTY error return path

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Date:   Mon, 16 Dec 2019 16:10:59 +0000
From:   Colin King <colin.king@...onical.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        "Andrew F . Davis" <afd@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <brian.starkey@....com>,
        John Stultz <john.stultz@...aro.org>,
        Sandeep Patil <sspatil@...roid.com>,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] dma-buf: fix resource leak on -ENOTTY error return path

From: Colin Ian King <colin.king@...onical.com>

The -ENOTTY error return path does not free the allocated
kdata as it returns directly. Fix this by returning via the
error handling label err.

Addresses-Coverity: ("Resource leak")
Fixes: c02a81fba74f ("dma-buf: Add dma-buf heaps framework")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/dma-buf/dma-heap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index 4f04d104ae61..80f2f5eac1e4 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -157,7 +157,8 @@ static long dma_heap_ioctl(struct file *file, unsigned int ucmd,
 		ret = dma_heap_ioctl_allocate(file, kdata);
 		break;
 	default:
-		return -ENOTTY;
+		ret = -ENOTTY;
+		goto err;
 	}
 
 	if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
-- 
2.24.0