• Gustavo A. R. Silva's avatar
    tcp_nv: fix potential integer overflow in tcpnv_acked · e4823fbd
    Gustavo A. R. Silva authored
    Add suffix ULL to constant 80000 in order to avoid a potential integer
    overflow and give the compiler complete information about the proper
    arithmetic to use. Notice that this constant is used in a context that
    expects an expression of type u64.
    
    The current cast to u64 effectively applies to the whole expression
    as an argument of type u64 to be passed to div64_u64, but it does
    not prevent it from being evaluated using 32-bit arithmetic instead
    of 64-bit arithmetic.
    
    Also, once the expression is properly evaluated using 64-bit arithmentic,
    there is no need for the parentheses and the external cast to u64.
    
    Addresses-Coverity-ID: 1357588 ("Unintentional integer overflow")
    Signed-off-by: default avatarGustavo A. R. Silva <gustavo@embeddedor.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    e4823fbd
tcp_nv.c 15.6 KB