[PATCH] platform: uv: fix missing checks for kcalloc

[Kangjie Lu]

In case kcalloc fails, the patch return an error to avoid
potential NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
---
 arch/x86/platform/uv/tlb_uv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 2c53b0f19329..1ac777f14846 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -2140,7 +2140,13 @@ static int __init init_per_cpu(int nuvhubs, int base_part_pnode)
 		timeout_us = calculate_destination_timeout();
 
 	uvhub_descs = kcalloc(nuvhubs, sizeof(struct uvhub_desc), GFP_KERNEL);
+	if (!uvhub_descs)
+		return 1;
 	uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
+	if (!uvhub_mask) {
+		kfree(uvhub_descs);
+		return 1;
+	}
 
 	if (get_cpu_topology(base_part_pnode, uvhub_descs, uvhub_mask))
 		goto fail;
-- 
2.17.1