Messages in this thread Patch in this message | | | From | Wei Yongjun <> | Subject | [PATCH -next] drm/meson: Fix potential NULL dereference in meson_drv_bind_master() | Date | Tue, 20 Mar 2018 14:20:30 +0000 |
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platform_get_resource_byname() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference a bit later in the code.
This is detected by Coccinelle semantic patch.
@@ expression pdev, res, n, t, e, e1, e2; @@
res = platform_get_resource_byname(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2);
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> --- drivers/gpu/drm/meson/meson_drv.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c index 3baceb7..32b1a6c 100644 --- a/drivers/gpu/drm/meson/meson_drv.c +++ b/drivers/gpu/drm/meson/meson_drv.c @@ -197,6 +197,8 @@ static int meson_drv_bind_master(struct device *dev, bool has_components) priv->io_base = regs; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hhi"); + if (!res) + return -EINVAL; /* Simply ioremap since it may be a shared register zone */ regs = devm_ioremap(dev, res->start, resource_size(res)); if (!regs) { @@ -213,6 +215,8 @@ static int meson_drv_bind_master(struct device *dev, bool has_components) } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmc"); + if (!res) + return -EINVAL; /* Simply ioremap since it may be a shared register zone */ regs = devm_ioremap(dev, res->start, resource_size(res)); if (!regs) {
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