Applied "spi: ti-qspi: Make sure res_mmap != NULL before dereferencing it" to the spi tree

[Mark Brown <broonie@xxxxxxxxxx>]

The patch

   spi: ti-qspi: Make sure res_mmap != NULL before dereferencing it

has been applied to the spi tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 6282f122913e632c2415c236a2b5faa8ef368b10 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
Date: Mon, 14 May 2018 11:11:29 +0200
Subject: [PATCH] spi: ti-qspi: Make sure res_mmap != NULL before dereferencing
 it

resource_size() is dereferencing the res without checking that it is
not NULL, so we need to do the check before calling resource_size().

Fixes: b95cb394ab59 ("spi: ti-qspi: Implement the spi_mem interface")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 drivers/spi/spi-ti-qspi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index c54b760e00ed..5f19016bbf10 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -718,7 +718,9 @@ static int ti_qspi_probe(struct platform_device *pdev)
 				"memory mapped resource not required\n");
 		}
 	}
-	qspi->mmap_size = resource_size(res_mmap);
+
+	if (res_mmap)
+		qspi->mmap_size = resource_size(res_mmap);
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-- 
2.17.0

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