linux-kernel - Re: [PATCH] net_dma: fix memory leak in dma_pin_iocvec

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Date:	Fri, 19 Sep 2014 16:04:41 +0400
From:	Roman Gushchin <klamm@...dex-team.ru>
To:	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net_dma: fix memory leak in dma_pin_iocvec_pages

Ping?

03.09.2014, 13:38, "Roman Gushchin" <klamm@...dex-team.ru>:
>  dma_pin_iovec_pages() calls get_user_pages() for each iovec. If
>  get_user_pages() returns a number smaller than the requested number,
>  dma_pin_iovec_pages() calls dma_unpin_iovec_pages(). It releases
>  previously allocated iovecs, but pages pinned by last get_user_pages()
>  call remain unreleased.
>  Fix this by calling put_page() for each such page.
>
>  Signed-off-by: Roman Gushchin <klamm@...dex-team.ru>
>  ---
>   drivers/dma/iovlock.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
>  diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c
>  index bb48a57..c393cf9 100644
>  --- a/drivers/dma/iovlock.c
>  +++ b/drivers/dma/iovlock.c
>  @@ -107,8 +107,11 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
>                           NULL);
>                   up_read(&current->mm->mmap_sem);
>
>  - if (ret != page_list->nr_pages)
>  + if (ret != page_list->nr_pages) {
>  + for (i = 0; i < ret; i++)
>  + put_page(page_list->pages[i]);
>                           goto unpin;
>  + }
>
>                   local_list->nr_iovecs = i + 1;
>           }
>  --
>  1.9.3
>
>  --
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