[PATCH 5.4 022/434] dpaa2-ptp: fix double free of the ptp_qoriq IRQ

Greg Kroah-Hartman
2019-12-29T18:10:48Z

From: Ioana Ciornei <ioana.ciornei@nxp.com>

[ Upstream commit daa6eb5a149519583c8a8cb31945f06417d21902 ]

Upon reusing the ptp_qoriq driver, the ptp_qoriq_free() function was
used on the remove path to free any allocated resources.
The ptp_qoriq IRQ is among these resources that are freed in
ptp_qoriq_free() even though it is also a managed one (allocated using
devm_request_threaded_irq).

Drop the resource managed version of requesting the IRQ in order to not
trigger a double free of the interrupt as below:

[ 226.731005] Trying to free already-free IRQ 126
[ 226.735533] WARNING: CPU: 6 PID: 749 at kernel/irq/manage.c:1707
__free_irq+0x9c/0x2b8
[ 226.743435] Modules linked in:
[ 226.746480] CPU: 6 PID: 749 Comm: bash Tainted: G W
5.4.0-03629-gfd7102c32b2c-dirty #912
[ 226.755857] Hardware name: NXP Layerscape LX2160ARDB (DT)
[ 226.761244] pstate: 40000085 (nZcv daIf -PAN -UAO)
[ 226.766022] pc : __free_irq+0x9c/0x2b8
[ 226.769758] lr : __free_irq+0x9c/0x2b8
[ 226.773493] sp : ffff8000125039f0
(...)
[ 226.856275] Call trace:
[ 226.858710] __free_irq+0x9c/0x2b8
[ 226.862098] free_irq+0x30/0x70
[ 226.865229] devm_irq_release+0x14/0x20
[ 226.869054] release_nodes+0x1b0/0x220
[ 226.872790] devres_release_all+0x34/0x50
[ 226.876790] device_release_driver_internal+0x100/0x1c0

Fixes: d346c9e86d86 ("dpaa2-ptp: reuse ptp_qoriq driver")
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c
@@ -160,10 +160,10 @@ static int dpaa2_ptp_probe(struct fsl_mc
irq = mc_dev->irqs[0];
ptp_qoriq->irq = irq->msi_desc->irq;

- err = devm_request_threaded_irq(dev, ptp_qoriq->irq, NULL,
- dpaa2_ptp_irq_handler_thread,
- IRQF_NO_SUSPEND | IRQF_ONESHOT,
- dev_name(dev), ptp_qoriq);
+ err = request_threaded_irq(ptp_qoriq->irq, NULL,
+ dpaa2_ptp_irq_handler_thread,
+ IRQF_NO_SUSPEND | IRQF_ONESHOT,
+ dev_name(dev), ptp_qoriq);
if (err < 0) {
dev_err(dev, "devm_request_threaded_irq(): %d\n", err);
goto err_free_mc_irq;
@@ -173,18 +173,20 @@ static int dpaa2_ptp_probe(struct fsl_mc
DPRTC_IRQ_INDEX, 1);
if (err < 0) {
dev_err(dev, "dprtc_set_irq_enable(): %d\n", err);
- goto err_free_mc_irq;
+ goto err_free_threaded_irq;
}

err = ptp_qoriq_init(ptp_qoriq, base, &dpaa2_ptp_caps);
if (err)
- goto err_free_mc_irq;
+ goto err_free_threaded_irq;

dpaa2_phc_index = ptp_qoriq->phc_index;
dev_set_drvdata(dev, ptp_qoriq);

return 0;

+err_free_threaded_irq:
+ free_irq(ptp_qoriq->irq, ptp_qoriq);
err_free_mc_irq:
fsl_mc_free_irqs(mc_dev);