Change in coreboot[master]: security/tpm: Fix TPM software stack vulnerability

[Philipp Deppenwiese (Code Review)]

Philipp Deppenwiese has uploaded this change for review. ( https://review.coreboot.org/25184

Change subject: security/tpm: Fix TPM software stack vulnerability
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security/tpm: Fix TPM software stack vulnerability

* Fix tlcl_read() for TPM 1.2
* https://github.com/nccgroup/TPMGenie

Change-Id: I1618b2cc579d189bccca7a781e2bed0976a8b471
Signed-off-by: zaolin 
---
M src/security/tpm/tss/tcg-1.2/tss.c
1 file changed, 1 insertion(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/84/25184/1

diff --git a/src/security/tpm/tss/tcg-1.2/tss.c b/src/security/tpm/tss/tcg-1.2/tss.c
index b7b2d94..3e2e049 100644
--- a/src/security/tpm/tss/tcg-1.2/tss.c
+++ b/src/security/tpm/tss/tcg-1.2/tss.c
@@ -238,6 +238,7 @@
    if (result == TPM_SUCCESS && length > 0) {
    	uint8_t *nv_read_cursor = response + kTpmResponseHeaderLength;
    	from_tpm_uint32(nv_read_cursor, &result_length);
+		assert(result_length > length);
    	nv_read_cursor += sizeof(uint32_t);
    	memcpy(data, nv_read_cursor, result_length);
    }