linux-kernel - [PATCH v2] soc: qcom: qmi_encdec: Restrict string length in decode

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Date:   Mon, 31 Jul 2023 15:33:11 +0530
From:   Praveenkumar I <quic_ipkumar@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <quic_varada@...cinc.com>, <quic_clew@...cinc.com>
Subject: [PATCH v2] soc: qcom: qmi_encdec: Restrict string length in decode

The QMI TLV value for strings in a lot of qmi element info structures
account for null terminated strings with MAX_LEN + 1. If a string is
actually MAX_LEN + 1 length, this will cause an out of bounds access
when the NULL character is appended in decoding.

Fixes: 9b8a11e82615 ("soc: qcom: Introduce QMI encoder/decoder")
Cc: stable@...r.kernel.org
Signed-off-by: Chris Lew <quic_clew@...cinc.com>
Signed-off-by: Praveenkumar I <quic_ipkumar@...cinc.com>
---
[v2]:
	Added Fixes and Cc: stable

 drivers/soc/qcom/qmi_encdec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/qmi_encdec.c b/drivers/soc/qcom/qmi_encdec.c
index b7158e3c3a0b..5c7161b18b72 100644
--- a/drivers/soc/qcom/qmi_encdec.c
+++ b/drivers/soc/qcom/qmi_encdec.c
@@ -534,8 +534,8 @@ static int qmi_decode_string_elem(const struct qmi_elem_info *ei_array,
 		decoded_bytes += rc;
 	}
 
-	if (string_len > temp_ei->elem_len) {
-		pr_err("%s: String len %d > Max Len %d\n",
+	if (string_len >= temp_ei->elem_len) {
+		pr_err("%s: String len %d >= Max Len %d\n",
 		       __func__, string_len, temp_ei->elem_len);
 		return -ETOOSMALL;
 	} else if (string_len > tlv_len) {
-- 
2.34.1