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bignum_mod: Fixed an issue with input checking in mpi_mod_residue_setup

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This patch is inverting the input type checking logic in the method,
in order to ensure that residue < modulus.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis
2022-11-16 16:29:15 +00:00
committed by Janos Follath
parent 8f24270630
commit a17ad48e2d
3 changed files with 51 additions and 2 deletions
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library/bignum_mod.c
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@ -39,7 +39,7 @@ int mbedtls_mpi_mod_residue_setup( mbedtls_mpi_mod_residue *r,
mbedtls_mpi_uint *p,
size_t p_limbs )
{
if( p_limbs < m->limbs || !mbedtls_mpi_core_lt_ct( m->p, p, p_limbs ) )
if( p_limbs > m->limbs || !mbedtls_mpi_core_lt_ct( p, m->p, m->limbs ) )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
r->limbs = m->limbs;