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SubjectRe: [PATCH] mmc: cavium: Fix use-after-free in of_platform_device_destroy
On 7 September 2017 at 13:24, Jan Glauber <jglauber@cavium.com> wrote:
> KASAN reported the following:
>
> [ 19.338655] ==================================================================
> [ 19.345946] BUG: KASAN: use-after-free in of_platform_device_destroy+0x88/0x100
> [ 19.345966] Read of size 8 at addr fffffe01aa6f1468 by task systemd-udevd/264
>
> [ 19.345983] CPU: 1 PID: 264 Comm: systemd-udevd Not tainted 4.13.0-jang+ #737
> [ 19.345989] Hardware name: Cavium ThunderX CN81XX board (DT)
> [ 19.345995] Call trace:
> [ 19.346013] [<fffffc800808b1b0>] dump_backtrace+0x0/0x368
> [ 19.346026] [<fffffc800808b6bc>] show_stack+0x24/0x30
> [ 19.346040] [<fffffc8008cbb944>] dump_stack+0xa4/0xc8
> [ 19.346057] [<fffffc80082c2870>] print_address_description+0x68/0x258
> [ 19.346070] [<fffffc80082c2d70>] kasan_report+0x238/0x2f8
> [ 19.346082] [<fffffc80082c14a8>] __asan_load8+0x88/0xb8
> [ 19.346098] [<fffffc8008aacee0>] of_platform_device_destroy+0x88/0x100
> [ 19.346131] [<fffffc8000e02fa4>] thunder_mmc_probe+0x314/0x550 [thunderx_mmc]
> [ 19.346147] [<fffffc800879d560>] pci_device_probe+0x158/0x1f8
> [ 19.346162] [<fffffc800886e53c>] driver_probe_device+0x394/0x5f8
> [ 19.346174] [<fffffc800886e8f4>] __driver_attach+0x154/0x158
> [ 19.346185] [<fffffc800886b12c>] bus_for_each_dev+0xdc/0x140
> [ 19.346196] [<fffffc800886d9f8>] driver_attach+0x38/0x48
> [ 19.346207] [<fffffc800886d148>] bus_add_driver+0x290/0x3c8
> [ 19.346219] [<fffffc800886fc5c>] driver_register+0xbc/0x1a0
> [ 19.346232] [<fffffc800879b78c>] __pci_register_driver+0xc4/0xd8
> [ 19.346260] [<fffffc8000e80024>] thunder_mmc_driver_init+0x24/0x10000 [thunderx_mmc]
> [ 19.346273] [<fffffc8008083a80>] do_one_initcall+0x98/0x1c0
> [ 19.346289] [<fffffc8008177b54>] do_init_module+0xe0/0x2cc
> [ 19.346303] [<fffffc8008175cf0>] load_module+0x3238/0x35c0
> [ 19.346318] [<fffffc8008176438>] SyS_finit_module+0x190/0x1a0
> [ 19.346329] [<fffffc80080834a0>] __sys_trace_return+0x0/0x4
>
> This is caused by:
>
> platform_device_register()
> -> platform_device_unregister(to_platform_device(dev))
> freeing struct device
> -> of_node_clear_flag(dev->of_node, ...)
> writing to the freed device
>
> The issue is solved by increasing the reference count before calling
> of_platform_device_destroy() so freeing the device is postponed after
> the call.
>
> Fixes: 8fb83b142823 ("mmc: cavium: Fix probing race with regulator")
> Signed-off-by: Jan Glauber <jglauber@cavium.com>

Thanks, applied for fixes and added a stable tag.

Kind regards
Uffe

> ---
> drivers/mmc/host/cavium-thunderx.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/cavium-thunderx.c b/drivers/mmc/host/cavium-thunderx.c
> index b9cc95998799..eee08d81b242 100644
> --- a/drivers/mmc/host/cavium-thunderx.c
> +++ b/drivers/mmc/host/cavium-thunderx.c
> @@ -7,6 +7,7 @@
> *
> * Copyright (C) 2016 Cavium Inc.
> */
> +#include <linux/device.h>
> #include <linux/dma-mapping.h>
> #include <linux/interrupt.h>
> #include <linux/mmc/mmc.h>
> @@ -149,8 +150,11 @@ static int thunder_mmc_probe(struct pci_dev *pdev,
> for (i = 0; i < CAVIUM_MAX_MMC; i++) {
> if (host->slot[i])
> cvm_mmc_of_slot_remove(host->slot[i]);
> - if (host->slot_pdev[i])
> + if (host->slot_pdev[i]) {
> + get_device(&host->slot_pdev[i]->dev);
> of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL);
> + put_device(&host->slot_pdev[i]->dev);
> + }
> }
> clk_disable_unprepare(host->clk);
> return ret;
> --
> 2.9.0.rc0.21.g7777322
>

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