From: Tianjia Zhang Date: Thu, 14 Dec 2023 03:08:34 +0000 (+0800) Subject: crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ba3c5574203034781ac4231acf117da917efcd2a;p=linux.git 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 Signed-off-by: Herbert Xu --- diff --git a/lib/crypto/mpi/ec.c b/lib/crypto/mpi/ec.c index 40f5908e57a4f..e16dca1e23d52 100644 --- a/lib/crypto/mpi/ec.c +++ b/lib/crypto/mpi/ec.c @@ -584,6 +584,9 @@ void mpi_ec_init(struct mpi_ec_ctx *ctx, enum gcry_mpi_ec_models model, ctx->a = mpi_copy(a); ctx->b = mpi_copy(b); + ctx->d = NULL; + ctx->t.two_inv_p = NULL; + ctx->t.p_barrett = use_barrett > 0 ? mpi_barrett_init(ctx->p, 0) : NULL; mpi_ec_get_reset(ctx);