On Sat, 2015-06-06 at 19:35 +0800, Firo Yang wrote:
> A smatch warning.
> When kmem_cache_alloc() failed to alloc memory, a null pointer
> will be returned. Redeference null pointer will generate
Dereferencing a null pointer will crash.
> an unnecessary oops. So, use it after check.
>
> Signed-off-by: Firo Yang <fir...@gmail.com>
> ---
> net/ipv4/fib_trie.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
> index 01bce15..34094c7 100644
> --- a/net/ipv4/fib_trie.c
> +++ b/net/ipv4/fib_trie.c
> @@ -326,12 +326,13 @@ static inline void empty_child_dec(struct key_vector *n)
> static struct key_vector *leaf_new(t_key key, struct fib_alias *fa)
> {
> struct tnode *kv = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL);
> - struct key_vector *l = kv->kv;
> + struct key_vector *l;
>
> if (!kv)
> return NULL;
>
> /* initialize key vector */
> + l = kv->kv;
> l->key = key;
> l->pos = 0;
> l->bits = 0;
Fixes: dc35dbeda3e0 ("fib_trie: Add tnode struct as a container for fields not
needed in key_vector")
Acked-by: Eric Dumazet <eduma...@google.com>
Thanks.
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