linux-kernel - [PATCH] dma-buf: free dmabuf->name in dma_buf

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Message-Id: <20200225204446.11378-1-xiyou.wangcong@gmail.com>
Date:   Tue, 25 Feb 2020 12:44:46 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     linux-media@...r.kernel.org
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        syzbot+b2098bc44728a4efb3e9@...kaller.appspotmail.com,
        Chenbo Feng <fengc@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] dma-buf: free dmabuf->name in dma_buf_release()

dma-buff name can be set via DMA_BUF_SET_NAME ioctl, but once set
it never gets freed.

Free it in dma_buf_release().

Fixes: bb2bb9030425 ("dma-buf: add DMA_BUF_SET_NAME ioctls")
Reported-by: syzbot+b2098bc44728a4efb3e9@...kaller.appspotmail.com
Acked-by: Chenbo Feng <fengc@...gle.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 drivers/dma-buf/dma-buf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index d4097856c86b..c343c7c10b4c 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -108,6 +108,7 @@ static int dma_buf_release(struct inode *inode, struct file *file)
 		dma_resv_fini(dmabuf->resv);
 
 	module_put(dmabuf->owner);
+	kfree(dmabuf->name);
 	kfree(dmabuf);
 	return 0;
 }
-- 
2.21.1