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crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init

When the mpi_ec_ctx structure is initialized, some fields are not
cleared, causing a crash when referencing the field when the
structure was released. Initially, this issue was ignored because
memory for mpi_ec_ctx is allocated with the __GFP_ZERO flag.
For example, this error will be triggered when calculating the
Za value for SM2 separately.

Fixes: d58bb7e55a8a ("lib/mpi: Introduce ec implementation to MPI library")
Cc: stable@vger.kernel.org # v6.5
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

authored by

Tianjia Zhang and committed by
Herbert Xu ba3c5574 ae3bed72

+3
+3
lib/crypto/mpi/ec.c
··· 584 584 ctx->a = mpi_copy(a); 585 585 ctx->b = mpi_copy(b); 586 586 587 + ctx->d = NULL; 588 + ctx->t.two_inv_p = NULL; 589 + 587 590 ctx->t.p_barrett = use_barrett > 0 ? mpi_barrett_init(ctx->p, 0) : NULL; 588 591 589 592 mpi_ec_get_reset(ctx);