On 10/28/24 1:49 AM, Jarkko Sakkinen wrote:
Do not continue tpm2_sessions_init() further if the null key pair creation
fails.
Cc: stable@xxxxxxxxxxxxxxx # v6.10+
Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation")
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
---
v8:
- Refine commit message.
v7:
- Add the error message back but fix it up a bit:
1. Remove 'TPM:' given dev_err().
2. s/NULL/null/ as this has nothing to do with the macro in libc.
3. Fix the reasoning: null key creation failed
v6:
- Address:
https://lore.kernel.org/linux-integrity/69c893e7-6b87-4daa-80db-44d1120e80fe@xxxxxxxxxxxxx/
as TPM RC is taken care of at the call site. Add also the missing
documentation for the return values.
v5:
- Do not print klog messages on error, as tpm2_save_context() already
takes care of this.
v4:
- Fixed up stable version.
v3:
- Handle TPM and POSIX error separately and return -ENODEV always back
to the caller.
v2:
- Refined the commit message.
---
drivers/char/tpm/tpm2-sessions.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c
index d3521aadd43e..a0306126e86c 100644
--- a/drivers/char/tpm/tpm2-sessions.c
+++ b/drivers/char/tpm/tpm2-sessions.c
@@ -1347,14 +1347,21 @@ static int tpm2_create_null_primary(struct tpm_chip *chip)
*
* Derive and context save the null primary and allocate memory in the
* struct tpm_chip for the authorizations.
+ *
+ * Return:
+ * * 0 - OK
+ * * -errno - A system error
+ * * TPM_RC - A TPM error
*/
int tpm2_sessions_init(struct tpm_chip *chip)
{
int rc;
rc = tpm2_create_null_primary(chip);
- if (rc)
- dev_err(&chip->dev, "TPM: security failed (NULL seed derivation): %d\n", rc);
+ if (rc) {
+ dev_err(&chip->dev, "null key creation failed with %d\n", rc);
+ return rc;
+ }
chip->auth = kmalloc(sizeof(*chip->auth), GFP_KERNEL);
if (!chip->auth)
