5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
[ Upstream commit ba3c5574203034781ac4231acf117da917efcd2a ]
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@xxxxxxxxxxxxxxx # v6.5
Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
lib/mpi/ec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/mpi/ec.c b/lib/mpi/ec.c
index c21470122dfc..941ba0b0067e 100644
--- a/lib/mpi/ec.c
+++ b/lib/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);
--
2.43.0
