From 225622256b1b7156624e281e1c0251c292ea24cd Mon Sep 17 00:00:00 2001 From: Zhang Shurong Date: Thu, 27 Apr 2023 01:02:20 +0800 Subject: wifi: rtw88: fix incorrect error codes in rtw_debugfs_copy_from_user If there is a failure during copy_from_user or user-provided data buffer is invalid, rtw_debugfs_copy_from_user should return negative error code instead of a positive value count. Fix this bug by returning correct error code. Moreover, the check of buffer against null is removed since it will be handled by copy_from_user. Signed-off-by: Zhang Shurong Reviewed-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/tencent_D2EB102CC7435C0110154E62ECA6A7D67505@qq.com --- drivers/net/wireless/realtek/rtw88/debug.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/debug.c b/drivers/net/wireless/realtek/rtw88/debug.c index fa3d73b333ba..3da477e1ebd3 100644 --- a/drivers/net/wireless/realtek/rtw88/debug.c +++ b/drivers/net/wireless/realtek/rtw88/debug.c @@ -183,8 +183,8 @@ static int rtw_debugfs_copy_from_user(char tmp[], int size, tmp_len = (count > size - 1 ? size - 1 : count); - if (!buffer || copy_from_user(tmp, buffer, tmp_len)) - return count; + if (copy_from_user(tmp, buffer, tmp_len)) + return -EFAULT; tmp[tmp_len] = '\0'; -- cgit