If there is a failure during copy_from_user or user-provided data
buffer is invalid, rtw_debugfs_set_rf_read should return negative
error code instead of a positive value count.
Fix this bug by returning correct error code.
Signed-off-by: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>
---
drivers/net/wireless/realtek/rtw88/debug.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c
index 259e6c15bc78..e033077d49b0 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.c
+++ b/drivers/net/wireless/realtek/rtw88/debug.c
@@ -456,14 +456,17 @@ static ssize_t rtw_debugfs_set_rf_read(struct file *filp,
char tmp[32 + 1];
u32 path, addr, mask;
int num;
+ int ret;
- rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 3);
+ ret = rtw_debugfs_copy_from_user(tmp, sizeof(tmp), buffer, count, 3);
+ if (ret < 0)
+ return ret;
num = sscanf(tmp, "%x %x %x", &path, &addr, &mask);
if (num != 3) {
rtw_warn(rtwdev, "invalid args, [path] [addr] [mask] [val]\n");
- return count;
+ return -EINVAL;
}
debugfs_priv->rf_path = path;
--
2.40.0
