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drm/sti: sti_vtg: Handle return NULL error from devm_ioremap_nocache

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[ Upstream commit 1ae0d5af347df224a6e76334683f13a96d915a44 ]

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@gmail.com>
Acked-by: Vincent Abriou <vincent.abriou@st.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arvind Yadav 2016-12-21 11:00:12 +05:30 committed by Greg Kroah-Hartman
parent 02c7292bb7
commit 38fa955da2
1 changed files with 4 additions and 0 deletions

4
drivers/gpu/drm/sti/sti_vtg.c

@ -429,6 +429,10 @@ static int vtg_probe(struct platform_device *pdev)
return -ENOMEM;
}
vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
if (!vtg->regs) {
DRM_ERROR("failed to remap I/O memory\n");
return -ENOMEM;
}
np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
if (np) {