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| author | Yang Yingliang <yangyingliang@huawei.com> | 2022-10-29 12:38:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-31 15:32:42 +0300 |
| commit | f7a440c89b6d460154efeb058272760e41bdfea8 (patch) | |
| tree | 1a4ee89078ded8d106d0ba4d3aa7663eb4aaf5d4 /drivers/i2c/muxes/i2c-mux-reg.c | |
| parent | 86fdf151b9b8385fe08e6b8327728cf106a7e252 (diff) | |
| download | linux-f7a440c89b6d460154efeb058272760e41bdfea8.tar.xz | |
i2c: mux: reg: check return value after calling platform_get_resource()
[ Upstream commit 2d47b79d2bd39cc6369eccf94a06568d84c906ae ]
It will cause null-ptr-deref in resource_size(), if platform_get_resource()
returns NULL, move calling resource_size() after devm_ioremap_resource() that
will check 'res' to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.
Fixes: b3fdd32799d8 ("i2c: mux: Add register-based mux i2c-mux-reg")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/i2c/muxes/i2c-mux-reg.c')
| -rw-r--r-- | drivers/i2c/muxes/i2c-mux-reg.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-reg.c b/drivers/i2c/muxes/i2c-mux-reg.c index 0e0679f65cf7..30a6de1694e0 100644 --- a/drivers/i2c/muxes/i2c-mux-reg.c +++ b/drivers/i2c/muxes/i2c-mux-reg.c @@ -183,13 +183,12 @@ static int i2c_mux_reg_probe(struct platform_device *pdev) if (!mux->data.reg) { dev_info(&pdev->dev, "Register not set, using platform resource\n"); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - mux->data.reg_size = resource_size(res); - mux->data.reg = devm_ioremap_resource(&pdev->dev, res); + mux->data.reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res); if (IS_ERR(mux->data.reg)) { ret = PTR_ERR(mux->data.reg); goto err_put_parent; } + mux->data.reg_size = resource_size(res); } if (mux->data.reg_size != 4 && mux->data.reg_size != 2 && |