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-rw-r--r--src/drivers/spi/tpm/tis.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/drivers/spi/tpm/tis.c b/src/drivers/spi/tpm/tis.c
index d3c727cb27..481c9da1d0 100644
--- a/src/drivers/spi/tpm/tis.c
+++ b/src/drivers/spi/tpm/tis.c
@@ -85,6 +85,11 @@ int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
uint8_t *recvbuf, size_t *rbuf_len)
{
int len = tpm2_process_command(sendbuf, sbuf_size, recvbuf, *rbuf_len);
+
+ if (len == 0)
+ return -1;
+
*rbuf_len = len;
+
return 0;
}