On Wed, May 2, 2018 at 00:35 AM <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> This is a note to let you know that I've just added the patch titled
> PCI: endpoint: Fix kernel panic after put_device()
> to the 4.16-stable tree which can be found at:
> http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> The filename of the patch is:
> pci-endpoint-fix-kernel-panic-after-put_device.patch
> and it can be found in the queue-4.16 subdirectory.
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@xxxxxxxxxxxxxxx> know about it.
This patch is the 2nd one of a series of patches. If you want to add it
to the stable tree without the first patch, you must add a
+ kfree(func_name);
before returning from the function.
The upstream commit of the first patch is
36cc14ac14c0d49d33820a82dab52a7edc802fef PCI: endpoint: Simplify name
allocation for EPF device
Kind regards,
Rolf
> From foo@baz Tue May 1 14:59:17 PDT 2018
> From: Rolf Evers-Fischer <rolf.evers.fischer@xxxxxxxxx>
> Date: Wed, 28 Feb 2018 18:32:19 +0100
> Subject: PCI: endpoint: Fix kernel panic after put_device()
> From: Rolf Evers-Fischer <rolf.evers.fischer@xxxxxxxxx>
> [ Upstream commit 9eef6a5c3b0bf90eb292d462ea267bcb6ad1c334 ]
> 'put_device()' calls the relase function 'pci_epf_dev_release()',
> which already frees 'epf->name' and 'epf'.
> Therefore we must not free them again after 'put_device()'.
> Fixes: 5e8cb4033807 ("PCI: endpoint: Add EP core layer to enable EP
> controller and EP functions")
> Signed-off-by: Rolf Evers-Fischer <rolf.evers.fischer@xxxxxxxxx>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Acked-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> ---
> drivers/pci/endpoint/pci-epf-core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> --- a/drivers/pci/endpoint/pci-epf-core.c
> +++ b/drivers/pci/endpoint/pci-epf-core.c
> @@ -243,7 +243,7 @@ struct pci_epf *pci_epf_create(const cha
> put_dev:
> put_device(dev);
> - kfree(epf->name);
> + return ERR_PTR(ret);
> free_func_name:
> kfree(func_name);
> Patches currently in stable-queue which might be from
> rolf.evers.fischer@xxxxxxxxx are
> queue-4.16/pci-endpoint-fix-kernel-panic-after-put_device.patch
