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 4.4-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-4.4 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 12:02:55 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
@@ -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) {
Patches currently in stable-queue which might be from arvind.yadav.cs@xxxxxxxxx are
queue-4.4/gpu-drm-mgag200-mgag200_main-handle-error-from-pci_iomap.patch
queue-4.4/media-imon-fix-null-ptr-deref-in-imon_probe.patch
queue-4.4/drm-sti-sti_vtg-handle-return-null-error-from-devm_ioremap_nocache.patch