From: Tianjia Zhang tianjia.zhang@linux.alibaba.com

stable inclusion from stable-v6.6.15 commit 7ebf812b7019fd2d4d5a7ca45ef4bf3a6f4bda0a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I99JP7 CVE: CVE-2023-52616

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

--------------------------------

commit ba3c5574203034781ac4231acf117da917efcd2a upstream.

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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Felix Fu fuzhen5@huawei.com --- lib/crypto/mpi/ec.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/lib/crypto/mpi/ec.c b/lib/crypto/mpi/ec.c index 40f5908e57a4..e16dca1e23d5 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);