This is a note to let you know that I've just added the patch titled
spi: hisi-kunpeng: Add verification for the max_frequency provided by the firmware
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-hisi-kunpeng-add-verification-for-the-max_freque.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3136aaee31485d3525d4c9a42acca56372e2abd3
Author: Devyn Liu <liudingyuan@xxxxxxxxxx>
Date: Tue Jul 30 11:20:40 2024 +0800
spi: hisi-kunpeng: Add verification for the max_frequency provided by the firmware
[ Upstream commit 5127c42c77de18651aa9e8e0a3ced190103b449c ]
If the value of max_speed_hz is 0, it may cause a division by zero
error in hisi_calc_effective_speed().
The value of max_speed_hz is provided by firmware.
Firmware is generally considered as a trusted domain. However, as
division by zero errors can cause system failure, for defense measure,
the value of max_speed is validated here. So 0 is regarded as invalid
and an error code is returned.
Signed-off-by: Devyn Liu <liudingyuan@xxxxxxxxxx>
Reviewed-by: Jay Fang <f.fangjian@xxxxxxxxxx>
Link: https://patch.msgid.link/20240730032040.3156393-3-liudingyuan@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/spi/spi-hisi-kunpeng.c b/drivers/spi/spi-hisi-kunpeng.c
index 6910b4d4c427..16054695bdb0 100644
--- a/drivers/spi/spi-hisi-kunpeng.c
+++ b/drivers/spi/spi-hisi-kunpeng.c
@@ -481,6 +481,9 @@ static int hisi_spi_probe(struct platform_device *pdev)
return -EINVAL;
}
+ if (host->max_speed_hz == 0)
+ return dev_err_probe(dev, -EINVAL, "spi-max-frequency can't be 0\n");
+
ret = device_property_read_u16(dev, "num-cs",
&host->num_chipselect);
if (ret)
