diff options
Diffstat (limited to 'thirdparty/mbedtls/library/bignum.c')
| -rw-r--r-- | thirdparty/mbedtls/library/bignum.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/thirdparty/mbedtls/library/bignum.c b/thirdparty/mbedtls/library/bignum.c index 2feb727d89..f133f6c13c 100644 --- a/thirdparty/mbedtls/library/bignum.c +++ b/thirdparty/mbedtls/library/bignum.c @@ -1354,6 +1354,12 @@ int mbedtls_mpi_sub_abs( mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi for( n = B->n; n > 0; n-- ) if( B->p[n - 1] != 0 ) break; + if( n > A->n ) + { + /* B >= (2^ciL)^n > A */ + ret = MBEDTLS_ERR_MPI_NEGATIVE_VALUE; + goto cleanup; + } carry = mpi_sub_hlp( n, X->p, B->p ); if( carry != 0 ) |