From: Denis Kirjanov <kda@linux-powerpc.org>
To: benh@kernel.crashing.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org,
Denis Kirjanov <kda@linux-powerpc.org>,
airlied@gmail.com
Subject: Re: [PATCH] agp/uninorth: fix a memleak in create_gatt_table
Date: Thu, 18 Jun 2015 17:34:56 +0300 [thread overview]
Message-ID: <CAOJe8K0UrsVQraHrxKUptOB9sVr_U9LEB3Ji6j4nMenHKNt2dg@mail.gmail.com> (raw)
In-Reply-To: <1434092231-4155-1-git-send-email-kda@linux-powerpc.org>
On 6/12/15, Denis Kirjanov <kda@linux-powerpc.org> wrote:
> Fix the memory leak in create_gatt_table:
> we've lost a kfree on the exit path for the pages array allocated
> in uninorth_create_gatt_table
>
> Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Hi Ben, Michael
Will you take the patch through your trees or do I need to send it to
Dave Airlie?
Thanks
> ---
> drivers/char/agp/uninorth-agp.c | 16 ++++++++++------
> 1 file changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/char/agp/uninorth-agp.c
> b/drivers/char/agp/uninorth-agp.c
> index a56ee9b..0575544 100644
> --- a/drivers/char/agp/uninorth-agp.c
> +++ b/drivers/char/agp/uninorth-agp.c
> @@ -361,6 +361,10 @@ static int agp_uninorth_resume(struct pci_dev *pdev)
> }
> #endif /* CONFIG_PM */
>
> +static struct {
> + struct page **pages_arr;
> +} uninorth_priv;
> +
> static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
> {
> char *table;
> @@ -371,7 +375,6 @@ static int uninorth_create_gatt_table(struct
> agp_bridge_data *bridge)
> int i;
> void *temp;
> struct page *page;
> - struct page **pages;
>
> /* We can't handle 2 level gatt's */
> if (bridge->driver->size_type == LVL2_APER_SIZE)
> @@ -400,8 +403,8 @@ static int uninorth_create_gatt_table(struct
> agp_bridge_data *bridge)
> if (table == NULL)
> return -ENOMEM;
>
> - pages = kmalloc((1 << page_order) * sizeof(struct page*), GFP_KERNEL);
> - if (pages == NULL)
> + uninorth_priv.pages_arr = kmalloc((1 << page_order) * sizeof(struct
> page*), GFP_KERNEL);
> + if (uninorth_priv.pages_arr == NULL)
> goto enomem;
>
> table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
> @@ -409,14 +412,14 @@ static int uninorth_create_gatt_table(struct
> agp_bridge_data *bridge)
> for (page = virt_to_page(table), i = 0; page <= virt_to_page(table_end);
> page++, i++) {
> SetPageReserved(page);
> - pages[i] = page;
> + uninorth_priv.pages_arr[i] = page;
> }
>
> bridge->gatt_table_real = (u32 *) table;
> /* Need to clear out any dirty data still sitting in caches */
> flush_dcache_range((unsigned long)table,
> (unsigned long)table_end + 1);
> - bridge->gatt_table = vmap(pages, (1 << page_order), 0, PAGE_KERNEL_NCG);
> + bridge->gatt_table = vmap(uninorth_priv.pages_arr, (1 << page_order), 0,
> PAGE_KERNEL_NCG);
>
> if (bridge->gatt_table == NULL)
> goto enomem;
> @@ -434,7 +437,7 @@ static int uninorth_create_gatt_table(struct
> agp_bridge_data *bridge)
> return 0;
>
> enomem:
> - kfree(pages);
> + kfree(uninorth_priv.pages_arr);
> if (table)
> free_pages((unsigned long)table, page_order);
> return -ENOMEM;
> @@ -456,6 +459,7 @@ static int uninorth_free_gatt_table(struct
> agp_bridge_data *bridge)
> */
>
> vunmap(bridge->gatt_table);
> + kfree(uninorth_priv.pages_arr);
> table = (char *) bridge->gatt_table_real;
> table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
>
> --
> 2.4.0
>
>
next prev parent reply other threads:[~2015-06-18 14:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-12 6:57 [PATCH] agp/uninorth: fix a memleak in create_gatt_table Denis Kirjanov
2015-06-18 14:34 ` Denis Kirjanov [this message]
2015-06-19 1:08 ` Benjamin Herrenschmidt
2015-09-07 7:30 ` Denis Kirjanov
2015-09-07 10:28 ` Michael Ellerman
2015-09-07 10:39 ` Denis Kirjanov
2015-09-08 3:51 ` Michael Ellerman
2015-10-02 8:48 ` Denis Kirjanov
2015-10-12 11:17 ` Michael Ellerman
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