This is a note to let you know that I've just added the patch titled
wifi: wil6210: debugfs: fix info leak in wil_write_file_wmi()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-wil6210-debugfs-fix-info-leak-in-wil_write_file.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 29f6d80aecb279597fc80ebee021d4556c4be453
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Fri Jul 15 13:35:18 2022 +0300
wifi: wil6210: debugfs: fix info leak in wil_write_file_wmi()
[ Upstream commit 7a4836560a6198d245d5732e26f94898b12eb760 ]
The simple_write_to_buffer() function will succeed if even a single
byte is initialized. However, we need to initialize the whole buffer
to prevent information leaks. Just use memdup_user().
Fixes: ff974e408334 ("wil6210: debugfs interface to send raw WMI command")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/Ysg14NdKAZF/hcNG@kili
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 55a809cb3105..675b2829b4c7 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -1004,18 +1004,12 @@ static ssize_t wil_write_file_wmi(struct file *file, const char __user *buf,
u16 cmdid;
int rc, rc1;
- if (cmdlen < 0)
+ if (cmdlen < 0 || *ppos != 0)
return -EINVAL;
- wmi = kmalloc(len, GFP_KERNEL);
- if (!wmi)
- return -ENOMEM;
-
- rc = simple_write_to_buffer(wmi, len, ppos, buf, len);
- if (rc < 0) {
- kfree(wmi);
- return rc;
- }
+ wmi = memdup_user(buf, len);
+ if (IS_ERR(wmi))
+ return PTR_ERR(wmi);
cmd = (cmdlen > 0) ? &wmi[1] : NULL;
cmdid = le16_to_cpu(wmi->command_id);
