Re: [PATCH v5 1/5] tpm: Return on tpm2_create_null_primary() failure

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On 9/21/24 8:08 AM, Jarkko Sakkinen wrote:
tpm2_sessions_init() does not ignores the result of

s/ignores/ignore

tpm2_create_null_primary(). Address this by returning -ENODEV to the
caller.

I am not sure why mapping all errors to -ENODEV resolves the fact that tpm2_sessions_init() does not ignore the result of tpm2_create_null_primary(). I think what you want is to return -ENODEV from tpm2_auto_startup.


Cc: stable@xxxxxxxxxxxxxxx # v6.10+
Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation")
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
---
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 | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c
index d3521aadd43e..0f09ac33ae99 100644
--- a/drivers/char/tpm/tpm2-sessions.c
+++ b/drivers/char/tpm/tpm2-sessions.c
@@ -1338,7 +1338,8 @@ static int tpm2_create_null_primary(struct tpm_chip *chip)
  		tpm2_flush_context(chip, null_key);
  	}
- return rc;
+	/* Map all errors to -ENODEV: */
+	return rc ? -ENODEV : rc;

return rc ? -ENODEV : 0;

  }
/**
@@ -1354,7 +1355,7 @@ int tpm2_sessions_init(struct tpm_chip *chip)
rc = tpm2_create_null_primary(chip);
  	if (rc)
-		dev_err(&chip->dev, "TPM: security failed (NULL seed derivation): %d\n", rc);
+		return rc;
chip->auth = kmalloc(sizeof(*chip->auth), GFP_KERNEL);
  	if (!chip->auth)




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