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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 |
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ad7877.h | ||
ads7846.h | ||
altera.h | ||
at73c213.h | ||
corgi_lcd.h | ||
ds1305.h | ||
eeprom.h | ||
flash.h | ||
libertas_spi.h | ||
max7301.h | ||
mc33880.h | ||
mmc_spi.h | ||
mxs-spi.h | ||
pxa2xx_spi.h | ||
rspi.h | ||
sh_hspi.h | ||
sh_msiof.h | ||
spi-fsl-dspi.h | ||
spi-mem.h | ||
spi.h | ||
spi_bitbang.h | ||
spi_gpio.h | ||
spi_oc_tiny.h | ||
tdo24m.h | ||
tle62x0.h | ||
xilinx_spi.h |