[PATCH v2] crypto: ccp - memset structure fields to zero before reuse

["Hook, Gary" <Gary.Hook@amd.com>]

The AES GCM function reuses an 'op' data structure, which members
contain values that must be cleared for each (re)use.

This fix resolves a crypto self-test failure:
alg: aead: gcm-aes-ccp encryption test failed (wrong result) on test vector 2, cfg="two even aligned splits"

Fixes: 36cf515b9bbe ("crypto: ccp - Enable support for AES GCM on v5 CCPs")

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---

Changes since v1:
 - Explain in the commit message that this fix resolves a failed test

 drivers/crypto/ccp/ccp-ops.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index a817f2755c58..9ecc1bb4b237 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -622,6 +622,7 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
 
 	unsigned long long *final;
 	unsigned int dm_offset;
+	unsigned int jobid;
 	unsigned int ilen;
 	bool in_place = true; /* Default value */
 	int ret;
@@ -660,9 +661,11 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
 		p_tag = scatterwalk_ffwd(sg_tag, p_inp, ilen);
 	}
 
+	jobid = CCP_NEW_JOBID(cmd_q->ccp);
+
 	memset(&op, 0, sizeof(op));
 	op.cmd_q = cmd_q;
-	op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
+	op.jobid = jobid;
 	op.sb_key = cmd_q->sb_key; /* Pre-allocated */
 	op.sb_ctx = cmd_q->sb_ctx; /* Pre-allocated */
 	op.init = 1;
@@ -813,6 +816,13 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
 	final[0] = cpu_to_be64(aes->aad_len * 8);
 	final[1] = cpu_to_be64(ilen * 8);
 
+	memset(&op, 0, sizeof(op));
+	op.cmd_q = cmd_q;
+	op.jobid = jobid;
+	op.sb_key = cmd_q->sb_key; /* Pre-allocated */
+	op.sb_ctx = cmd_q->sb_ctx; /* Pre-allocated */
+	op.init = 1;
+	op.u.aes.type = aes->type;
 	op.u.aes.mode = CCP_AES_MODE_GHASH;
 	op.u.aes.action = CCP_AES_GHASHFINAL;
 	op.src.type = CCP_MEMTYPE_SYSTEM;
-- 
2.17.1