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x86: uv - prevent NULL dereference in uv_system_init()

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We may reach NULL dereference oops if kmalloc failed.
Prevent it with explicit BUG_ON.

[ Impact: more controlled assert in 'impossible' scenario ]

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20090501202511.GE4633@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cyrill Gorcunov 2009-05-02 00:25:11 +04:00 committed by Ingo Molnar
parent 1cbac972ba
commit 9a8709d441
1 changed files with 3 additions and 0 deletions
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arch/x86/kernel/apic/x2apic_uv_x.c
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@ -569,15 +569,18 @@ void __init uv_system_init(void)
bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
uv_blade_info = kmalloc(bytes, GFP_KERNEL);
BUG_ON(!uv_blade_info);
get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
bytes = sizeof(uv_node_to_blade[0]) * num_possible_nodes();
uv_node_to_blade = kmalloc(bytes, GFP_KERNEL);
BUG_ON(!uv_node_to_blade);
memset(uv_node_to_blade, 255, bytes);
bytes = sizeof(uv_cpu_to_blade[0]) * num_possible_cpus();
uv_cpu_to_blade = kmalloc(bytes, GFP_KERNEL);
BUG_ON(!uv_cpu_to_blade);
memset(uv_cpu_to_blade, 255, bytes);
blade = 0;