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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-09-15 11:04:40 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-25 15:54:29 +0100 |
| commit | c3f29441b1035c23f5ae1d775d2a09c97ceb6a04 (patch) | |
| tree | 035e18dfc62d207edd13faf4c57930b42ca65d2e /scripts/docproc.c | |
| parent | 6a9820f17c104598a19ae93cfe6fbf58e937c2d7 (diff) | |
usb: gadget: udc: fotg210-udc: Fix a sleep-in-atomic-context bug in fotg210_get_status()
[ Upstream commit 2337a77c1cc86bc4e504ecf3799f947659c86026 ]
The driver may sleep in an interrupt handler.
The function call path (from bottom to top) in Linux-4.17 is:
[FUNC] fotg210_ep_queue(GFP_KERNEL)
drivers/usb/gadget/udc/fotg210-udc.c, 744:
fotg210_ep_queue in fotg210_get_status
drivers/usb/gadget/udc/fotg210-udc.c, 768:
fotg210_get_status in fotg210_setup_packet
drivers/usb/gadget/udc/fotg210-udc.c, 949:
fotg210_setup_packet in fotg210_irq (interrupt handler)
To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC.
If possible, spin_unlock() and spin_lock() around fotg210_ep_queue()
can be also removed.
This bug is found by my static analysis tool DSAC.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts/docproc.c')
0 files changed, 0 insertions, 0 deletions