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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2019-12-18 17:44:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-28 15:38:54 +0100 |
| commit | 4a117a1c581623d04bf09aa7455d8e7b66e8bb85 (patch) | |
| tree | c430041c54046457373bc8ac27b49b16f6bcdafc /drivers/usb | |
| parent | 02dc4e716e41455558112a19bef08195103d53f3 (diff) | |
uio: fix a sleep-in-atomic-context bug in uio_dmem_genirq_irqcontrol()
[ Upstream commit b74351287d4bd90636c3f48bc188c2f53824c2d4 ]
The driver may sleep while holding a spinlock.
The function call path (from bottom to top) in Linux 4.19 is:
kernel/irq/manage.c, 523:
synchronize_irq in disable_irq
drivers/uio/uio_dmem_genirq.c, 140:
disable_irq in uio_dmem_genirq_irqcontrol
drivers/uio/uio_dmem_genirq.c, 134:
_raw_spin_lock_irqsave in uio_dmem_genirq_irqcontrol
synchronize_irq() can sleep at runtime.
To fix this bug, disable_irq() is called without holding the spinlock.
This bug is found by a static analysis tool STCheck written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Link: https://lore.kernel.org/r/20191218094405.6009-1-baijiaju1990@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/usb')
0 files changed, 0 insertions, 0 deletions