linux-kernel - [PATCH AUTOSEL 6.0 04/16] crypto: hisilicon/qm - increase the memory of local variables

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Message-Id: <20221220012127.1222311-4-sashal@kernel.org>
Date:   Mon, 19 Dec 2022 20:21:14 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kai Ye <yekai13@...wei.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>, qianweili@...wei.com,
        wangzhou1@...ilicon.com, davem@...emloft.net,
        linux-crypto@...r.kernel.org
Subject: [PATCH AUTOSEL 6.0 04/16] crypto: hisilicon/qm - increase the memory of local variables

From: Kai Ye <yekai13@...wei.com>

[ Upstream commit 3efe90af4c0c46c58dba1b306de142827153d9c0 ]

Increase the buffer to prevent stack overflow by fuzz test. The maximum
length of the qos configuration buffer is 256 bytes. Currently, the value
of the 'val buffer' is only 32 bytes. The sscanf does not check the dest
memory length. So the 'val buffer' may stack overflow.

Signed-off-by: Kai Ye <yekai13@...wei.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/hisilicon/qm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 9fa2efe60153..ed3185c4d33a 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -252,7 +252,6 @@
 #define QM_QOS_MIN_CIR_B		100
 #define QM_QOS_MAX_CIR_U		6
 #define QM_QOS_MAX_CIR_S		11
-#define QM_QOS_VAL_MAX_LEN		32
 #define QM_DFX_BASE		0x0100000
 #define QM_DFX_STATE1		0x0104000
 #define QM_DFX_STATE2		0x01040C8
@@ -4583,7 +4582,7 @@ static ssize_t qm_get_qos_value(struct hisi_qm *qm, const char *buf,
 			       unsigned int *fun_index)
 {
 	char tbuf_bdf[QM_DBG_READ_LEN] = {0};
-	char val_buf[QM_QOS_VAL_MAX_LEN] = {0};
+	char val_buf[QM_DBG_READ_LEN] = {0};
 	u32 tmp1, device, function;
 	int ret, bus;
 
-- 
2.35.1