From: Christoffer Dall <christoffer.dall@linaro.org>
Date: Fri, 13 Oct 2017 11:40:11 +0200
Subject: KVM: arm64: its: Fix missing dynamic allocation check in
scan_its_table
Patch-mainline: v4.14-rc8
Git-commit: 8c1a8a32438b95792bbd8719d1cd4fe36e9eba03
References: bsc#1077761
We currently allocate an entry dynamically, but we never check if the
allocation actually succeeded. We actually don't need a dynamic
allocation, because we know the maximum size of an ITS table entry, so
we can simply use an allocation on the stack.
Cc: <stable@vger.kernel.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Alexander Graf <agraf@suse.de>
---
virt/kvm/arm/vgic/vgic-its.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1801,37 +1801,33 @@
static int scan_its_table(struct vgic_its *its, gpa_t base, int size, int esz,
int start_id, entry_fn_t fn, void *opaque)
{
- void *entry = kzalloc(esz, GFP_KERNEL);
struct kvm *kvm = its->dev->kvm;
unsigned long len = size;
int id = start_id;
gpa_t gpa = base;
+ char entry[esz];
int ret;
+ memset(entry, 0, esz);
+
while (len > 0) {
int next_offset;
size_t byte_offset;
ret = kvm_read_guest(kvm, gpa, entry, esz);
if (ret)
- goto out;
+ return ret;
next_offset = fn(its, id, entry, opaque);
- if (next_offset <= 0) {
- ret = next_offset;
- goto out;
- }
+ if (next_offset <= 0)
+ return next_offset;
byte_offset = next_offset * esz;
id += next_offset;
gpa += byte_offset;
len -= byte_offset;
}
- ret = 1;
-
-out:
- kfree(entry);
- return ret;
+ return 1;
}
/**