On Mon, Aug 23, 2021 at 03:20:14PM -0700, Nathan Chancellor wrote:
> Clang warns:
>
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:901:6: warning:
> variable 'place' is used uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
> if (chnl > 14) {
> ^~~~~~~~~
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:909:9: note:
> uninitialized use occurs here
> return place;
> ^~~~~
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:901:2: note: remove
> the 'if' if its condition is always true
> if (chnl > 14) {
> ^~~~~~~~~~~~~~~
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:899:10: note:
> initialize the variable 'place' to silence this warning
> u8 place;
> ^
> = '\0'
> 1 warning generated.
>
> Commit 369956ae5720 ("rtlwifi: rtl8192de: Remove redundant variable
> initializations") removed the initialization of place but it appears
> that this removal was in the wrong function.
>
> _rtl92c_phy_get_rightchnlplace() returns place's value at the end of the
> function so now if the if statement is false, place never gets
> initialized. Add that initialization back to address the warning.
>
> place's initialization is not necessary in
> rtl92d_get_rightchnlplace_for_iqk() as place is only used within the if
> statement so it can be removed, which is likely what was intended in the
> first place.
>
> Fixes: 369956ae5720 ("rtlwifi: rtl8192de: Remove redundant variable initializations")
> Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Thanks, I tripped over this too.
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
-Kees
> ---
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> index 8ae69d914312..9b83c710c9b8 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> @@ -896,7 +896,7 @@ static void _rtl92d_ccxpower_index_check(struct ieee80211_hw *hw,
>
> static u8 _rtl92c_phy_get_rightchnlplace(u8 chnl)
> {
> - u8 place;
> + u8 place = chnl;
>
> if (chnl > 14) {
> for (place = 14; place < sizeof(channel5g); place++) {
> @@ -1363,7 +1363,7 @@ static void _rtl92d_phy_switch_rf_setting(struct ieee80211_hw *hw, u8 channel)
>
> u8 rtl92d_get_rightchnlplace_for_iqk(u8 chnl)
> {
> - u8 place = chnl;
> + u8 place;
>
> if (chnl > 14) {
> for (place = 14; place < sizeof(channel_all); place++) {
>
> base-commit: 609c1308fbc6446fd6d8fec42b80e157768a5362
> --
> 2.33.0
>
--
Kees Cook
