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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-11 17:08:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-11 17:08:14 -0700
commitd14d7f14f177834788a276fc7b1317b539cedca2 (patch)
treef646397d522ae94ff1457d3d1bde6ea834afe8d5 /mm
parent6cdfa54cd22984ae785b0d496b53405d6da9ad1d (diff)
parent01bd2ac2f55a1916d81dace12fa8d7ae1c79b5ea (diff)
Merge tag 'for-linus-5.1a-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from Juergen Gross: "xen fixes and features: - remove fallback code for very old Xen hypervisors - three patches for fixing Xen dom0 boot regressions - an old patch for Xen PCI passthrough which was never applied for unknown reasons - some more minor fixes and cleanup patches" * tag 'for-linus-5.1a-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen: fix dom0 boot on huge systems xen, cpu_hotplug: Prevent an out of bounds access xen: remove pre-xen3 fallback handlers xen/ACPI: Switch to bitmap_zalloc() x86/xen: dont add memory above max allowed allocation x86: respect memory size limiting via mem= parameter xen/gntdev: Check and release imported dma-bufs on close xen/gntdev: Do not destroy context while dma-bufs are in use xen/pciback: Don't disable PCI_COMMAND on PCI device reset. xen-scsiback: mark expected switch fall-through xen: mark expected switch fall-through
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6b05576fb4ec..cd23c081924d 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -96,10 +96,16 @@ void mem_hotplug_done(void)
cpus_read_unlock();
}
+u64 max_mem_size = U64_MAX;
+
/* add this memory to iomem resource */
static struct resource *register_memory_resource(u64 start, u64 size)
{
struct resource *res, *conflict;
+
+ if (start + size > max_mem_size)
+ return ERR_PTR(-E2BIG);
+
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
if (!res)
return ERR_PTR(-ENOMEM);