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wifi: rtlwifi: fix incorrect error codes in rtl_debugfs_set_write_rfreg()

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[ 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>
This commit is contained in:
Wei Chen 2023-03-26 05:31:38 +00:00 committed by Greg Kroah-Hartman
parent f5331b6960
commit 8b9af7b6aa
1 changed files with 3 additions and 3 deletions
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6
drivers/net/wireless/realtek/rtlwifi/debug.c
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@ -416,8 +416,8 @@ 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';
@ -427,7 +427,7 @@ 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);