Here, If devm_ioremap_nocache will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference. This error check
will avoid NULL pointer dereference.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
---
drivers/gpu/drm/sti/sti_vtac.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/sti/sti_vtac.c b/drivers/gpu/drm/sti/sti_vtac.c
index cf7fe8a..dd749e9 100644
--- a/drivers/gpu/drm/sti/sti_vtac.c
+++ b/drivers/gpu/drm/sti/sti_vtac.c
@@ -191,6 +191,10 @@ static int sti_vtac_probe(struct platform_device *pdev)
if (res) {
vtac->phy_regs = devm_ioremap_nocache(dev, res->start,
resource_size(res));
+ if (!vtac->phy_regs) {
+ DRM_ERROR("failed to remap I/O memory\n");
+ return -ENOMEM;
+ }
sti_vtac_tx_set_config(vtac);
} else {
--
1.7.9.5
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