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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hulk Robot <hulkci@huawei.com>,
        Zhihao Cheng <chengzhihao1@huawei.com>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.12 315/677] char: tpm: fix error return code in tpm_cr50_i2c_tis_recv()
Date:   Wed, 12 May 2021 16:46:01 +0200
Message-Id: <20210512144847.681716557@linuxfoundation.org>
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From: Zhihao Cheng <chengzhihao1@huawei.com>

[ Upstream commit 3d785d73b4c1014839d9f9af0ee526f8d5706a73 ]

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 3a253caaad11 ("char: tpm: add i2c driver for cr50")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/char/tpm/tpm_tis_i2c_cr50.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
index ec9a65e7887d..f19c227d20f4 100644
--- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
+++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
@@ -483,6 +483,7 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len)
 	expected = be32_to_cpup((__be32 *)(buf + 2));
 	if (expected > buf_len) {
 		dev_err(&chip->dev, "Buffer too small to receive i2c data\n");
+		rc = -E2BIG;
 		goto out_err;
 	}
 
-- 
2.30.2