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Merge pull request #6942 from ucko/2023a-bignum

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mbedtls_mpi_sub_abs: Skip memcpy when redundant (#6701).
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Gilles Peskine
2023-02-01 11:36:25 +01:00
committed by GitHub
parent c567b74e6e a2b674f9a7
commit a193986aab
2 changed files with 5 additions and 1 deletions
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library/bignum.c
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@@ -1009,7 +1009,7 @@ int mbedtls_mpi_sub_abs(mbedtls_mpi *X, const mbedtls_mpi *A, const mbedtls_mpi
/* Set the high limbs of X to match A. Don't touch the lower limbs
* because X might be aliased to B, and we must not overwrite the
* significant digits of B. */
if (A->n > n) {
if (A->n > n && A != X) {
memcpy(X->p + n, A->p + n, (A->n - n) * ciL);
}
if (X->n > A->n) {