Re: [PATCH 3.13 100/105] dmaengine: pl330: Fix NULL pointer dereference on driver unbind

Krzysztof Kozlowski
2014-10-28T07:58:29Z

On pon, 2014-10-27 at 11:57 -0700, Kamal Mostafa wrote:
> 3.13.11.10 -stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
>
> commit 6e4a2a83f95826201bbd89f55522537ea52d1d67 upstream.

Hi,

Please drop this patch from stable-3.13. This is fix only for 3.17. I
made mistake when searching for commit introducing this bug.

Actually this is fix for c26939e5204c ("dmaengine: pl330: Remove
pl330_chan_ctrl()") which was introduced in 3.17.

Best regards,
Krzysztof

>
> Fix a NULL pointer dereference after unbinding the driver, if channel
> resources were not yet allocated (no call to
> pl330_alloc_chan_resources()):
> $ echo 12850000.mdma > /sys/bus/amba/drivers/dma-pl330/unbind
> [ 13.606533] DMA pl330_control: removing pch: eeab6800, chan: eeab6814, thread: (null)
> [ 13.614472] Unable to handle kernel NULL pointer dereference at virtual address 0000000c
> [ 13.622537] pgd = ee284000
> [ 13.625228] [0000000c] *pgd=6e1e4831, *pte=00000000, *ppte=00000000
> [ 13.631482] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
> [ 13.636859] Modules linked in:
> [ 13.639903] CPU: 0 PID: 1 Comm: sh Not tainted 3.17.0-rc3-next-20140904-00004-g7020ffc33ca3-dirty #420
> [ 13.649187] task: ee80a800 ti: ee888000 task.ti: ee888000
> [ 13.654589] PC is at _stop+0x8/0x2c8
> [ 13.658131] LR is at pl330_control+0x70/0x2e8
> [ 13.662468] pc : [<c0206028>] lr : [<c020649c>] psr: 60000093
> [ 13.662468] sp : ee889e58 ip : 00000001 fp : 000bab70
> [ 13.673922] r10: eeab6814 r9 : ee16debc r8 : 00000000
> [ 13.679131] r7 : eeab685c r6 : 60000013 r5 : ee16de10 r4 : eeab6800
> [ 13.685641] r3 : 00000002 r2 : 00000000 r1 : 00010000 r0 : 00000000
> [ 13.692153] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user
> [ 13.699357] Control: 10c5387d Table: 6e28404a DAC: 00000015
> [ 13.705085] Process sh (pid: 1, stack limit = 0xee888240)
> [ 13.710466] Stack: (0xee889e58 to 0xee88a000)
> [ 13.714808] 9e40: 00000002 eeab6800
> [ 13.722969] 9e60: ee16de10 eeab6800 ee16de10 60000013 eeab685c c020649c 00000000 c040280c
> [ 13.731128] 9e80: ee889e80 ee889e80 ee16de18 ee16de10 eeab6880 eeab6814 00200200 eeab68a8
> [ 13.739287] 9ea0: 00100100 c0208048 00000000 c0409fc4 eea80800 eea808f8 c0605c44 0000000e
> [ 13.747446] 9ec0: 0000000e eeb3960c eeb39600 c0203c48 eea80800 c0605c44 c0605a8c c023f694
> [ 13.755605] 9ee0: ee80a800 eea80834 eea80800 c023f704 ee80a800 eea80800 c0605c44 c023e8ec
> [ 13.763764] 9f00: 0000000e ee149780 ee29e580 ee889f80 ee29e580 c023e19c 0000000e c01167e4
> [ 13.771923] 9f20: c01167a0 00000000 00000000 c0115e88 00000000 00000000 ee0b1a00 0000000e
> [ 13.780082] 9f40: b6f48000 ee889f80 0000000e ee888000 b6f48000 c00bfadc 00000000 00000003
> [ 13.788241] 9f60: 00000000 00000000 00000000 ee0b1a00 ee0b1a00 0000000e b6f48000 c00bfdf4
> [ 13.796401] 9f80: 00000000 00000000 ffffffff 0000000e b6f48000 b6edc5d0 00000004 c000e7a4
> [ 13.804560] 9fa0: 00000000 c000e620 0000000e b6f48000 00000001 b6f48000 0000000e 00000000
> [ 13.812719] 9fc0: 0000000e b6f48000 b6edc5d0 00000004 0000000e b6f4c8c0 000c3470 000bab70
> [ 13.820879] 9fe0: 00000000 bed2aa50 b6e18bdc b6e6b52c 60000010 00000001 c0c0c0c0 c0c0c0c0
> [ 13.829058] [<c0206028>] (_stop) from [<c020649c>] (pl330_control+0x70/0x2e8)
> [ 13.836165] [<c020649c>] (pl330_control) from [<c0208048>] (pl330_remove+0xb0/0xdc)
> [ 13.843800] [<c0208048>] (pl330_remove) from [<c0203c48>] (amba_remove+0x24/0xc0)
> [ 13.851272] [<c0203c48>] (amba_remove) from [<c023f694>] (__device_release_driver+0x70/0xc4)
> [ 13.859685] [<c023f694>] (__device_release_driver) from [<c023f704>] (device_release_driver+0x1c/0x28)
> [ 13.868971] [<c023f704>] (device_release_driver) from [<c023e8ec>] (unbind_store+0x58/0x90)
> [ 13.877303] [<c023e8ec>] (unbind_store) from [<c023e19c>] (drv_attr_store+0x20/0x2c)
> [ 13.885036] [<c023e19c>] (drv_attr_store) from [<c01167e4>] (sysfs_kf_write+0x44/0x48)
> [ 13.892928] [<c01167e4>] (sysfs_kf_write) from [<c0115e88>] (kernfs_fop_write+0xc0/0x17c)
> [ 13.901090] [<c0115e88>] (kernfs_fop_write) from [<c00bfadc>] (vfs_write+0xa0/0x1a8)
> [ 13.908812] [<c00bfadc>] (vfs_write) from [<c00bfdf4>] (SyS_write+0x40/0x8c)
> [ 13.915850] [<c00bfdf4>] (SyS_write) from [<c000e620>] (ret_fast_syscall+0x0/0x30)
> [ 13.923392] Code: e5813010 e12fff1e e92d40f0 e24dd00c (e590200c)
> [ 13.929467] ---[ end trace 10064e15a5929cf8 ]---
>
> Terminate the thread and free channel resource only if channel resources
> were allocated (thread is not NULL).
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> Fixes: b3040e40675e ("DMA: PL330: Add dma api driver")
> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
> Signed-off-by: Kamal Mostafa <kamal@canonical.com>
> ---
> drivers/dma/pl330.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index df7fabb..5b03b4a 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -3080,8 +3080,10 @@ static int pl330_remove(struct amba_device *adev)
> list_del(&pch->chan.device_node);
>
> /* Flush the channel */
> - pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0);
> - pl330_free_chan_resources(&pch->chan);
> + if (pch->thread) {
> + pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0);
> + pl330_free_chan_resources(&pch->chan);
> + }
> }
>
> pi = &pdmac->pif;