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Subject[PATCH] slimbus: qcom: fix potential NULL dereference in qcom_slim_prg_slew()
Date
platform_get_resource_byname() may fail and in this case a NULL
dereference will occur.

Fix it to use devm_platform_ioremap_resource_byname() instead of calling
platform_get_resource_byname() and devm_ioremap().

This is detected by Coccinelle semantic patch.

@@
expression pdev, res, n, t, e, e1, e2;
@@

res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t,
n);
+ if (!res)
+ return -EINVAL;
... when != res == NULL
e = devm_ioremap(e1, res->start, e2);

Fixes: ad7fcbc308b0 ("slimbus: qcom: Add Qualcomm Slimbus controller driver")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
---
drivers/slimbus/qcom-ctrl.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/slimbus/qcom-ctrl.c b/drivers/slimbus/qcom-ctrl.c
index 4aad256..f04b961 100644
--- a/drivers/slimbus/qcom-ctrl.c
+++ b/drivers/slimbus/qcom-ctrl.c
@@ -472,15 +472,10 @@ static void qcom_slim_rxwq(struct work_struct *work)
static void qcom_slim_prg_slew(struct platform_device *pdev,
struct qcom_slim_ctrl *ctrl)
{
- struct resource *slew_mem;
-
if (!ctrl->slew_reg) {
/* SLEW RATE register for this SLIMbus */
- slew_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
- "slew");
- ctrl->slew_reg = devm_ioremap(&pdev->dev, slew_mem->start,
- resource_size(slew_mem));
- if (!ctrl->slew_reg)
+ ctrl->slew_reg = devm_platform_ioremap_resource_byname(pdev, "slew");
+ if (IS_ERR(ctrl->slew_reg))
return;
}

--
2.9.5
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