linux-kernel - [PATCH] tpm: add check after commands attribs tab allocation

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Message-ID: <157048479752.25182.17480591993061064051.stgit@tstruk-mobl1.jf.intel.com>
Date:   Mon, 07 Oct 2019 14:46:37 -0700
From:   Tadeusz Struk <tadeusz.struk@...el.com>
To:     jarkko.sakkinen@...ux.intel.com
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, tadeusz.struk@...el.com
Subject: [PATCH] tpm: add check after commands attribs tab allocation

devm_kcalloc() can fail and return NULL so we need to check for that.

Fixes: 58472f5cd4f6f ("tpm: validate TPM 2.0 commands")
Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
---
 drivers/char/tpm/tpm2-cmd.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index ba9acae83bff..5817dfe5c5d2 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -939,6 +939,10 @@ static int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
 
 	chip->cc_attrs_tbl = devm_kcalloc(&chip->dev, 4, nr_commands,
 					  GFP_KERNEL);
+	if (!chip->cc_attrs_tbl) {
+		rc = -ENOMEM;
+		goto out;
+	}
 
 	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
 	if (rc)