crypto/fsl: Clear the memory when blob decapsulation fails

issue: blob decapsulation operation store the decrypted data
       in memory even if ICV check failed.

fix: clear the blob data output memory.

Fixes: c5de15cbc8 (crypto/fsl: Add command for encapsulating/decapsulating blobs)
Signed-off-by: Gaurav Jain <gaurav.jain@nxp.com>
Reviewed-by: Kshitiz Varshney <kshitiz.varshney@nxp.com>
Tested-by: Kshitiz Varshney <kshitiz.varshney@nxp.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>

diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c
index e8202cc..9b6e4bc 100644 (file)
--- a/drivers/crypto/fsl/fsl_blob.c
+++ b/drivers/crypto/fsl/fsl_blob.c
@@ -71,6 +71,10 @@ int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
        ret = run_descriptor_jr(desc);
 
        if (ret) {
+               /* clear the blob data output buffer */
+               memset(dst, 0x00, len);
+               size = ALIGN(len, ARCH_DMA_MINALIGN);
+               flush_dcache_range((unsigned long)dst, (unsigned long)dst + size);
                printf("Error in blob decapsulation: %d\n", ret);
        } else {
                size = ALIGN(len, ARCH_DMA_MINALIGN);