4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Ralf Baechle <[email protected]> commit 66fd848cadaa6be974a8c780fbeb328f0af4d3bd upstream. For certain arguments such as saddr = 0xc0a8fd60, daddr = 0xc0a8fda1, len = 80, proto = 17, sum = 0x7eae049d there will be a carry when folding the intermediate 64 bit checksum to 32 bit but the code doesn't add the carry back to the one's complement sum, thus an incorrect result will be generated. Reported-by: Mark Zhang <[email protected]> Signed-off-by: Ralf Baechle <[email protected]> Reviewed-by: James Hogan <[email protected]> Signed-off-by: James Hogan <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/mips/include/asm/checksum.h | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/mips/include/asm/checksum.h +++ b/arch/mips/include/asm/checksum.h @@ -186,7 +186,9 @@ static inline __wsum csum_tcpudp_nofold( " daddu %0, %4 \n" " dsll32 $1, %0, 0 \n" " daddu %0, $1 \n" + " sltu $1, %0, $1 \n" " dsra32 %0, %0, 0 \n" + " addu %0, $1 \n" #endif " .set pop" : "=r" (sum)
