[lvc-project] [PATCH rtw-next] wifi: rtw89: phy: fix uninitialized variable access in rtw89_phy_cfo_set_crystal_cap()

[Ping-Ke Shih]

Alexey Velichayshiy <a.velichayshiy at ispras.ru> wrote:
> In the rtw89_phy_cfo_set_crystal_cap() function, for chips other than
> RTL8852A/RTL8851B, the values read by rtw89_mac_read_xtal_si() are
> stored into the local variables sc_xi_val and sc_xo_val. If either
> read fails, these variables remain uninitialized, they are later
> used to update cfo->crystal_cap and in debug print statements. This
> can lead to undefined behavior.
> 
> Fix the issue by initializing sc_xi_val and sc_xo_val to zero,
> like is implemented in vendor driver.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 8379fa611536 ("rtw89: 8852c: add write/read crystal function in CFO
> tracking")
> Signed-off-by: Alexey Velichayshiy <a.velichayshiy at ispras.ru>

Acked-by: Ping-Ke Shih <pkshih at realtek.com>