4.19-stable review patch. If anyone has any objections, please let me know.
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From: Ma Ke make24@iscas.ac.cn
[ Upstream commit 0f245463b01ea254ae90e1d0389e90b0e7d8dc75 ]
Zero and negative number is not a valid IRQ for in-kernel code and the irq_of_parse_and_map() function returns zero on error. So this check for valid IRQs should only accept values > 0.
Fixes: 44dab88e7cc9 ("spi: add spi_ppc4xx driver") Signed-off-by: Ma Ke make24@iscas.ac.cn Link: https://patch.msgid.link/20240724084047.1506084-1-make24@iscas.ac.cn Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-ppc4xx.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c index 58765a62fc15b..8a1290fb4dd9d 100644 --- a/drivers/spi/spi-ppc4xx.c +++ b/drivers/spi/spi-ppc4xx.c @@ -495,6 +495,9 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
/* Request IRQ */ hw->irqnum = irq_of_parse_and_map(np, 0); + if (hw->irqnum <= 0) + goto free_host; + ret = request_irq(hw->irqnum, spi_ppc4xx_int, 0, "spi_ppc4xx_of", (void *)hw); if (ret) {