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crypto: ccp - Fix checks for SNP_VLEK_LOAD input buffer length

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>

authored by

Michael Roth and committed by
Herbert Xu ed53a505 4e53be21

+1
+1
drivers/crypto/ccp/sev-dev.c
··· 234 234 case SEV_CMD_SNP_CONFIG: return sizeof(struct sev_user_data_snp_config); 235 235 case SEV_CMD_SNP_COMMIT: return sizeof(struct sev_data_snp_commit); 236 236 case SEV_CMD_SNP_FEATURE_INFO: return sizeof(struct sev_data_snp_feature_info); 237 + case SEV_CMD_SNP_VLEK_LOAD: return sizeof(struct sev_user_data_snp_vlek_load); 237 238 default: return 0; 238 239 } 239 240