From: Wei Chen harperchen1110@gmail.com
[ Upstream commit 905a9241e4e8c15d2c084fee916280514848fe35 ]
If there is a failure during copy_from_user or user-provided data buffer is invalid, rtl_debugfs_set_write_rfreg 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/20230326053138.91338-1-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 0b1bc04cb6adb..602717928887d 100644 --- a/drivers/net/wireless/realtek/rtlwifi/debug.c +++ b/drivers/net/wireless/realtek/rtlwifi/debug.c @@ -375,8 +375,8 @@ static ssize_t rtl_debugfs_set_write_rfreg(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';
@@ -386,7 +386,7 @@ static ssize_t rtl_debugfs_set_write_rfreg(struct file *filp, if (num != 4) { rtl_dbg(rtlpriv, COMP_ERR, DBG_DMESG, "Format is <path> <addr> <mask> <data>\n"); - return count; + return -EINVAL; }
rtl_set_rfreg(hw, path, addr, bitmask, data);