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net: hns3: add input length check for debugfs write function

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If the input length reaches the maximum value of size_t, the reverse is
triggered when 1 is added. In addition, there is no need to have such a
large length. Therefore, the input length should be checked and the value
should be less than or equal to 1024.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Reviewed-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yufeng Mo 2019-08-09 10:31:10 +08:00 committed by David S. Miller
parent eb977d996e
commit 7ac243f99d
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
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@ -8,6 +8,7 @@
#include "hns3_enet.h"
#define HNS3_DBG_READ_LEN 256
#define HNS3_DBG_WRITE_LEN 1024
static struct dentry *hns3_dbgfs_root;
@ -322,6 +323,9 @@ static ssize_t hns3_dbg_cmd_write(struct file *filp, const char __user *buffer,
test_bit(HNS3_NIC_STATE_RESETTING, &priv->state))
return 0;
if (count > HNS3_DBG_WRITE_LEN)
return -ENOSPC;
cmd_buf = kzalloc(count + 1, GFP_KERNEL);
if (!cmd_buf)
return count;