From 6c9fe645f8444bd4586e26b545cc9dceb162f03a Mon Sep 17 00:00:00 2001 From: Patrick Georgi Date: Wed, 12 May 2021 14:54:49 +0200 Subject: [PATCH 13/19] src/security/tpm: Deal with zero length tlcl writes While memcpy(foo, bar, 0) should be a no-op, that's hard to prove for a compiler and so gcc 11.1 complains about the use of an uninitialized "bar" even though it's harmless in this case. Change-Id: Idbffa508c2cd68790efbc0b4ab97ae1b4d85ad51 Signed-off-by: Patrick Georgi Reviewed-on: https://review.coreboot.org/c/coreboot/+/54095 Tested-by: build bot (Jenkins) Reviewed-by: Jacob Garber Reviewed-by: Angel Pons --- src/security/tpm/tss/tcg-1.2/tss.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/security/tpm/tss/tcg-1.2/tss.c b/src/security/tpm/tss/tcg-1.2/tss.c index 8b7778ddb2..413b68193f 100644 --- a/src/security/tpm/tss/tcg-1.2/tss.c +++ b/src/security/tpm/tss/tcg-1.2/tss.c @@ -215,7 +215,8 @@ uint32_t tlcl_write(uint32_t index, const void *data, uint32_t length) to_tpm_uint32(cmd.buffer + tpm_nv_write_cmd.index, index); to_tpm_uint32(cmd.buffer + tpm_nv_write_cmd.length, length); - memcpy(cmd.buffer + tpm_nv_write_cmd.data, data, length); + if (length > 0) + memcpy(cmd.buffer + tpm_nv_write_cmd.data, data, length); return tlcl_send_receive(cmd.buffer, response, sizeof(response)); } -- 2.25.1