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spi: s3c64xx: avoid possible negative array index

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The platform id is used as an index into the fifo_lvl_mask array.
Platforms can come with a negative device ID, PLATFORM_DEVID_NONE (-1),
thus we risked a negative array index. Catch such cases and fail to
probe.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20240207120431.2766269-6-tudor.ambarus@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Tudor Ambarus 2024-02-07 12:04:19 +00:00 committed by Mark Brown
parent 7256d6bdd4
commit a336d41bbe
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1 changed files with 3 additions and 0 deletions
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3
drivers/spi/spi-s3c64xx.c
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@ -1189,6 +1189,9 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
"Failed to get alias id\n");
sdd->port_id = ret;
} else {
if (pdev->id < 0)
return dev_err_probe(&pdev->dev, -EINVAL,
"Negative platform ID is not allowed\n");
sdd->port_id = pdev->id;
}