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From: Vasily Averin <vvs@virtuozzo.com>
To: linux-integrity@vger.kernel.org
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Peter Huewe <peterhuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>
Subject: [PATCH] tpm_tis: extra chip->ops check on error path in tpm_tis_core_init
Date: Sat, 13 Jun 2020 17:18:33 +0300	[thread overview]
Message-ID: <8d6e3656-1662-dc71-8876-c7f0f11a11b1@virtuozzo.com> (raw)

Found by smatch:
drivers/char/tpm/tpm_tis_core.c:1088 tpm_tis_core_init() warn:
 variable dereferenced before check 'chip->ops' (see line 979)

'chip->ops' is assigned in the beginning of function
in tpmm_chip_alloc->tpm_chip_alloc
and is used before first possible goto to error path.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
 drivers/char/tpm/tpm_tis_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 2435216..65ab1b0 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1085,7 +1085,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 
 	return 0;
 out_err:
-	if ((chip->ops != NULL) && (chip->ops->clk_enable != NULL))
+	if (chip->ops->clk_enable != NULL)
 		chip->ops->clk_enable(chip, false);
 
 	tpm_tis_remove(chip);
-- 
1.8.3.1


             reply	other threads:[~2020-06-13 14:18 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-13 14:18 Vasily Averin [this message]
2020-06-17  2:10 ` [PATCH] tpm_tis: extra chip->ops check on error path in tpm_tis_core_init Jarkko Sakkinen
2020-06-17  2:26 ` Jerry Snitselaar
2020-06-17 23:29   ` Jarkko Sakkinen

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