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| author | Jonas Gorski <jonas.gorski@gmail.com> | 2023-06-29 16:43:05 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-06-30 16:53:52 +0300 |
| commit | 7c1f23ad34fcdace50275a6aa1e1969b41c6233f (patch) | |
| tree | 20ebb4ef61931ff6415426bb00790565833c22cd /drivers/spi/spi-bcm-qspi.c | |
| parent | d10005837be83906bbd2078c3b4f9dfcbd6c95b6 (diff) | |
| download | linux-7c1f23ad34fcdace50275a6aa1e1969b41c6233f.tar.xz | |
spi: bcm-qspi: return error if neither hif_mspi nor mspi is available
If neither a "hif_mspi" nor "mspi" resource is present, the driver will
just early exit in probe but still return success. Apart from not doing
anything meaningful, this would then also lead to a null pointer access
on removal, as platform_get_drvdata() would return NULL, which it would
then try to dereference when trying to unregister the spi master.
Fix this by unconditionally calling devm_ioremap_resource(), as it can
handle a NULL res and will then return a viable ERR_PTR() if we get one.
The "return 0;" was previously a "goto qspi_resource_err;" where then
ret was returned, but since ret was still initialized to 0 at this place
this was a valid conversion in 63c5395bb7a9 ("spi: bcm-qspi: Fix
use-after-free on unbind"). The issue was not introduced by this commit,
only made more obvious.
Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Kamal Dasu <kamal.dasu@broadcom.com>
Link: https://lore.kernel.org/r/20230629134306.95823-1-jonas.gorski@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-bcm-qspi.c')
| -rw-r--r-- | drivers/spi/spi-bcm-qspi.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c index 6b46a3b67c41..d91dfbe47aa5 100644 --- a/drivers/spi/spi-bcm-qspi.c +++ b/drivers/spi/spi-bcm-qspi.c @@ -1543,13 +1543,9 @@ int bcm_qspi_probe(struct platform_device *pdev, res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mspi"); - if (res) { - qspi->base[MSPI] = devm_ioremap_resource(dev, res); - if (IS_ERR(qspi->base[MSPI])) - return PTR_ERR(qspi->base[MSPI]); - } else { - return 0; - } + qspi->base[MSPI] = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->base[MSPI])) + return PTR_ERR(qspi->base[MSPI]); res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "bspi"); if (res) { |