4.4-stable review patch. If anyone has any objections, please let me know.
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From: Arvind Yadav arvind.yadav.cs@gmail.com
[ 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 --- drivers/gpu/drm/sti/sti_vtg.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/sti/sti_vtg.c +++ b/drivers/gpu/drm/sti/sti_vtg.c @@ -346,6 +346,10 @@ static int vtg_probe(struct platform_dev 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) {