From: Wei Chen harperchen1110@gmail.com
[ Upstream commit 5dbe1f8eb8c5ac69394400a5b86fd81775e96c43 ]
If there is a failure during copy_from_user or user-provided data buffer is invalid, rtl_debugfs_set_write_reg 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.
Fixes: 610247f46feb ("rtlwifi: Improve debugging by using debugfs") Signed-off-by: Wei Chen harperchen1110@gmail.com Reviewed-by: Simon Horman simon.horman@corigine.com Signed-off-by: Kalle Valo kvalo@kernel.org Link: https://lore.kernel.org/r/20230326054217.93492-1-harperchen1110@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/realtek/rtlwifi/debug.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtlwifi/debug.c b/drivers/net/wireless/realtek/rtlwifi/debug.c index c8db166a7dc80..3866ea300a70b 100644 --- a/drivers/net/wireless/realtek/rtlwifi/debug.c +++ b/drivers/net/wireless/realtek/rtlwifi/debug.c @@ -298,8 +298,8 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp,
tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 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';
@@ -307,7 +307,7 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp, num = sscanf(tmp, "%x %x %x", &addr, &val, &len);
if (num != 3) - return count; + return -EINVAL;
switch (len) { case 1: