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b709e0e768
commit27b536a2ecupstream. The carry flag calculation fails when r01.m_high is saturated (0xFFFFFFFFFFFFFFFF) and addition of lower bits overflows. The condition (r01.m_high < product.m_high) doesn't handle the case where r01.m_high == product.m_high and an additional carry exists from lower-bit overflow. When commit3c4b23901a("crypto: ecdh - Add ECDH software support") introduced crypto/ecc.c, it split the muladd() function in the micro-ecc library into separate mul_64_64() and add_128_128() helpers. It seems the check got lost in translation. Add proper handling for this boundary by accounting for the carry from the lower addition. Fixes:3c4b23901a("crypto: ecdh - Add ECDH software support") Signed-off-by: Anastasia Tishchenko <sv3iry@gmail.com> Cc: stable@vger.kernel.org # v4.8+ Reviewed-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1673 lines
42 KiB
1673 lines
42 KiB