[stable-6.12 3/4] crypto: ccp - Fix checks for SNP_VLEK_LOAD input buffer length

[Jack Wang <jinpu.wang@ionos.com>]

From: Michael Roth <michael.roth@amd.com>

commit ed53a5050f42a3243a7ed8dfa49030e54034b952 upstream.

The SNP_VLEK_LOAD IOCTL currently fails due to sev_cmd_buffer_len()
returning the default expected buffer length of 0 instead of the correct
value, which would be sizeof(struct sev_user_data_snp_vlek_load). Add
specific handling for SNP_VLEK_LOAD so the correct expected size is
returned.

Reported-by: Diego GonzalezVillalobos <Diego.GonzalezVillalobos@amd.com>
Cc: Diego GonzalezVillalobos <Diego.GonzalezVillalobos@amd.com>
Fixes: 332d2c1d713e ("crypto: ccp: Add the SNP_VLEK_LOAD command")
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
[Jack: sev_cmd_buffer_len() in queue/6.12 does not yet have the
 SEV_CMD_SNP_FEATURE_INFO case the upstream context line matched
 against (it lands in a later, unrelated commit not queued here),
 so the new SEV_CMD_SNP_VLEK_LOAD case was placed directly after
 SEV_CMD_SNP_COMMIT instead. No functional difference from upstream.]
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
 drivers/crypto/ccp/sev-dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 7c05cae7e577..6e08378eb5fa 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -226,6 +226,7 @@ static int sev_cmd_buffer_len(int cmd)
 	case SEV_CMD_SNP_GUEST_REQUEST:		return sizeof(struct sev_data_snp_guest_request);
 	case SEV_CMD_SNP_CONFIG:		return sizeof(struct sev_user_data_snp_config);
 	case SEV_CMD_SNP_COMMIT:		return sizeof(struct sev_data_snp_commit);
+	case SEV_CMD_SNP_VLEK_LOAD:		return sizeof(struct sev_user_data_snp_vlek_load);
 	default:				return 0;
 	}
 
-- 
2.43.0