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

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[ Upstream commit 905a9241e4 ]

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: 610247f46f ("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 7f6714fc2a
commit 4eb666646c
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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@@ -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); tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count);
if (!buffer || copy_from_user(tmp, buffer, tmp_len)) if (copy_from_user(tmp, buffer, tmp_len))
return count; return -EFAULT;
tmp[tmp_len] = '\0'; tmp[tmp_len] = '\0';
@@ -386,7 +386,7 @@ static ssize_t rtl_debugfs_set_write_rfreg(struct file *filp,
if (num != 4) { if (num != 4) {
rtl_dbg(rtlpriv, COMP_ERR, DBG_DMESG, rtl_dbg(rtlpriv, COMP_ERR, DBG_DMESG,
"Format is <path> <addr> <mask> <data>\n"); "Format is <path> <addr> <mask> <data>\n");
return count; return -EINVAL;
} }
rtl_set_rfreg(hw, path, addr, bitmask, data); rtl_set_rfreg(hw, path, addr, bitmask, data);