Mark Hasemeyer 96474ea47d spi: Fix null dereference on suspend ... commit bef4a48f4e upstream. A race condition exists where a synchronous (noqueue) transfer can be active during a system suspend. This can cause a null pointer dereference exception to occur when the system resumes. Example order of events leading to the exception: 1. spi_sync() calls __spi_transfer_message_noqueue() which sets ctlr->cur_msg 2. Spi transfer begins via spi_transfer_one_message() 3. System is suspended interrupting the transfer context 4. System is resumed 6. spi_controller_resume() calls spi_start_queue() which resets cur_msg to NULL 7. Spi transfer context resumes and spi_finalize_current_message() is called which dereferences cur_msg (which is now NULL) Wait for synchronous transfers to complete before suspending by acquiring the bus mutex and setting/checking a suspend flag. Signed-off-by: Mark Hasemeyer <markhas@chromium.org> Link: https://lore.kernel.org/r/20231107144743.v1.1.I7987f05f61901f567f7661763646cb7d7919b528@changeid Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-11-28 17:19:55 +00:00
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acpi	ACPI: APEI: Fix AER info corruption when error status data has multiple sections	2023-11-28 17:19:37 +00:00
asm-generic	hyperv-fixes for v6.6-rc6	2023-10-10 11:01:21 -07:00
clocksource
crypto
drm	drm: bridge: samsung-dsim: Fix waiting for empty cmd transfer FIFO on older Exynos	2023-11-20 11:59:08 +01:00
dt-bindings
keys
kunit
kvm	KVM: arm64: timers: Correctly handle TGE flip with CNTPOFF_EL2	2023-10-12 16:55:21 +01:00
linux	spi: Fix null dereference on suspend	2023-11-28 17:19:55 +00:00
math-emu
media	media: ipu-bridge: increase sensor_name size	2023-11-28 17:19:46 +00:00
memory
misc
net	net: sched: do not offload flows with a helper in act_ct	2023-11-28 17:19:54 +00:00
pcmcia
ras
rdma
rv
scsi	scsi: sd: Introduce manage_shutdown device flag	2023-10-27 10:00:19 +09:00
soc	firmware: tegra: Add suspend hook and reset BPMP IPC early on resume	2023-11-20 11:59:16 +01:00
sound	ASoC: SOF: Pass PCI SSID to machine driver	2023-11-28 17:19:42 +00:00
target
trace	neighbor: tracing: Move pin6 inside CONFIG_IPV6=y section	2023-10-18 11:16:43 +01:00
uapi	vsock: read from socket's error queue	2023-11-28 17:19:38 +00:00
ufs
vdso
video	fbdev: uvesafb: Remove uvesafb_exec() prototype from include/video/uvesafb.h	2023-10-16 23:19:34 +02:00
xen	arm/xen: remove lazy mode related definitions	2023-09-19 07:04:49 +02:00