| Message ID | 20221114004322.257455-1-tanghui20@huawei.com |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | i2c: mux: reg: Fix possible null-ptr-deref | expand |
On Mon, Nov 14, 2022 at 08:43:22AM +0800, Hui Tang wrote: > It will cause null-ptr-deref when resource_size(res) invoked, > if platform_get_resource() returns NULL. > > Fixes: b3fdd32799d8 ("i2c: mux: Add register-based mux i2c-mux-reg") > Signed-off-by: Hui Tang <tanghui20@huawei.com> Correct, yet I applied this older patch instead: http://patchwork.ozlabs.org/project/linux-i2c/patch/20221029093825.3425857-1-yangyingliang@huawei.com/
diff --git a/drivers/i2c/muxes/i2c-mux-reg.c b/drivers/i2c/muxes/i2c-mux-reg.c index 0e0679f65cf7..d26de1017385 100644 --- a/drivers/i2c/muxes/i2c-mux-reg.c +++ b/drivers/i2c/muxes/i2c-mux-reg.c @@ -184,12 +184,12 @@ static int i2c_mux_reg_probe(struct platform_device *pdev) 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); 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 &&
It will cause null-ptr-deref when resource_size(res) invoked, if platform_get_resource() returns NULL. Fixes: b3fdd32799d8 ("i2c: mux: Add register-based mux i2c-mux-reg") Signed-off-by: Hui Tang <tanghui20@huawei.com> --- drivers/i2c/muxes/i2c-mux-reg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)