• Willem de Bruijn's avatar
    net: always initialize pagedlen · aba36930
    Willem de Bruijn authored
    In ip packet generation, pagedlen is initialized for each skb at the
    start of the loop in __ip(6)_append_data, before label alloc_new_skb.
    
    Depending on compiler options, code can be generated that jumps to
    this label, triggering use of an an uninitialized variable.
    
    In practice, at -O2, the generated code moves the initialization below
    the label. But the code should not rely on that for correctness.
    
    Fixes: 15e36f5b ("udp: paged allocation with gso")
    Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    aba36930
ip_output.c 39.5 KB