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staging: r8188eu: prevent array underflow in rtw_hal_update_ra_mask()

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The problem is that "mac_id" is a u32 so this check for underflow does
not work when "mac_id" is zero.  In that situation, "mac_id - 1" is
UINT_MAX instead of -1 so the condition is true.  It leads to an
array underflow on the next line.

Fixes: 8cd574e6af ("staging: r8188eu: introduce new hal dir for RTL8188eu driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210930122604.GB10068@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2021-09-30 15:26:04 +03:00 committed by Greg Kroah-Hartman
parent 7ff4034e91
commit 37f12202c5
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/r8188eu/hal/hal_intf.c
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@ -248,7 +248,7 @@ void rtw_hal_update_ra_mask(struct adapter *adapt, u32 mac_id, u8 rssi_level)
#ifdef CONFIG_88EU_AP_MODE
struct sta_info *psta = NULL;
struct sta_priv *pstapriv = &adapt->stapriv;
if ((mac_id - 1) > 0)
if (mac_id >= 2)
psta = pstapriv->sta_aid[(mac_id - 1) - 1];
if (psta)
add_RATid(adapt, psta, 0);/* todo: based on rssi_level*/