[PATCH 5.4 144/389] wifi: wil6210: debugfs: fix uninitialized variable use in `wil_write_file_wmi()`

Greg Kroah-Hartman
2022-08-23T11:27:44Z

From: Ammar Faizi <ammarfaizi2@gnuweeb.org>

[ Upstream commit d578e0af3a003736f6c440188b156483d451b329 ]

Commit 7a4836560a61 changes simple_write_to_buffer() with memdup_user()
but it forgets to change the value to be returned that came from
simple_write_to_buffer() call. It results in the following warning:

warning: variable 'rc' is uninitialized when used here [-Wuninitialized]
return rc;
^~

Remove rc variable and just return the passed in length if the
memdup_user() succeeds.

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 7a4836560a6198d245d5732e26f94898b12eb760 ("wifi: wil6210: debugfs: fix info leak in wil_write_file_wmi()")
Fixes: ff974e4083341383d3dd4079e52ed30f57f376f0 ("wil6210: debugfs interface to send raw WMI command")
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220724202452.61846-1-ammar.faizi@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/wil6210/debugfs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index b82af3a49912..1e38fdf92d1d 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -1021,7 +1021,7 @@ static ssize_t wil_write_file_wmi(struct file *file, const char __user *buf,
void *cmd;
int cmdlen = len - sizeof(struct wmi_cmd_hdr);
u16 cmdid;
- int rc, rc1;
+ int rc1;

if (cmdlen < 0 || *ppos != 0)
return -EINVAL;
@@ -1038,7 +1038,7 @@ static ssize_t wil_write_file_wmi(struct file *file, const char __user *buf,

wil_info(wil, "0x%04x[%d] -> %d\n", cmdid, cmdlen, rc1);

- return rc;
+ return len;
}

static const struct file_operations fops_wmi = {
--
2.35.1