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SubjectRe: [PATCH] x86/platform/uv: move kmalloc() NULL check routine
On Fri, Sep 06, 2019 at 08:29:51AM +0900, Austin Kim wrote:
> The result of kmalloc should have been checked ahead of below statement:
> pqp = (struct bau_pq_entry *)vp;
>
> Move BUG_ON(!vp) before above statement.
>
> Signed-off-by: Austin Kim <austindh.kim@gmail.com>
> ---
> arch/x86/platform/uv/tlb_uv.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
> index 20c389a..5f0a96bf 100644
> --- a/arch/x86/platform/uv/tlb_uv.c
> +++ b/arch/x86/platform/uv/tlb_uv.c
> @@ -1804,9 +1804,9 @@ static void pq_init(int node, int pnode)
>
> plsize = (DEST_Q_SIZE + 1) * sizeof(struct bau_pq_entry);
> vp = kmalloc_node(plsize, GFP_KERNEL, node);
> - pqp = (struct bau_pq_entry *)vp;
> - BUG_ON(!pqp);
> + BUG_ON(!vp);

Ick! Don't crash the whole machine if you are out of memory, that's a
totally lazy and broken driver. Fix this up properly please.

But the original code is just fine (from a this is doing what I want it
to do point of view), I don't see the need to change anything here, you
did not modify any logic at all.

thanks,

greg k-h

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