This is a note to let you know that I've just added the patch titled drm/sti: sti_vtg: Handle return NULL error from devm_ioremap_nocache to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-sti-sti_vtg-handle-return-null-error-from-devm_ioremap_nocache.patch and it can be found in the queue-3.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sun Nov 19 12:16:40 CET 2017 From: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx> Date: Wed, 21 Dec 2016 11:00:12 +0530 Subject: drm/sti: sti_vtg: Handle return NULL error from devm_ioremap_nocache From: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx> [ 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@xxxxxxxxx> Acked-by: Vincent Abriou <vincent.abriou@xxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -303,6 +303,10 @@ 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) { Patches currently in stable-queue which might be from arvind.yadav.cs@xxxxxxxxx are queue-3.18/gpu-drm-mgag200-mgag200_main-handle-error-from-pci_iomap.patch queue-3.18/media-imon-fix-null-ptr-deref-in-imon_probe.patch queue-3.18/drm-sti-sti_vtg-handle-return-null-error-from-devm_ioremap_nocache.patch