In the Linux kernel, the following vulnerability has been resolved: crypto: ecdsa - Harden against integer overflows in DIVROUNDUP() Herbert notes that DIVROUNDUP() may overflow unnecessarily if an ecdsa implementation's ->keysize() callback returns an unusually large value. Herbert instead suggests (for a division by 8): X / 8 + !!(X & 7) Based on this formula, introduce a generic DIVROUNDUPPOW2() macro and use it in lieu of DIVROUNDUP() for ->keysize() return values. Additionally, use the macro in eccdigitsfrombytes(), whose "nbytes" parameter is a ->keysize() return value in some instances, or a user-specified ASN.1 length in the case of ecdsagetsignaturers().
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