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H A D | tcp_nv.c | diff e4823fbd229bfbba368b40cdadb8f4eeb20604cc Wed Jan 31 05:21:48 CET 2018 Gustavo A. R. Silva <gustavo@embeddedor.com> tcp_nv: fix potential integer overflow in tcpnv_acked
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: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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