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Add fix for described UB

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This commit is contained in:
GriffinR 2023-02-01 15:44:48 -05:00
parent 603d870ea0
commit 020266463c
1 changed files with 7 additions and 1 deletions
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8
src/wireless_communication_status_screen.c
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@ -126,7 +126,6 @@ static const u8 *const sHeaderTexts[NUM_GROUPTYPES + 1] = {
// Activity, group type, number of players // Activity, group type, number of players
// 0 players means the number of players can change and should be counted dynamically // 0 players means the number of players can change and should be counted dynamically
// GROUPTYPE_TOTAL have no unique group and are simply counted in the total of "people communicating" // GROUPTYPE_TOTAL have no unique group and are simply counted in the total of "people communicating"
// UB: GROUPTYPE_NONE (-1) can potentially be used as an index into a u8[4] in CountPlayersInGroupAndGetActivity
static const u8 sActivityGroupInfo[][3] = { static const u8 sActivityGroupInfo[][3] = {
{ACTIVITY_BATTLE_SINGLE, GROUPTYPE_BATTLE, 2}, {ACTIVITY_BATTLE_SINGLE, GROUPTYPE_BATTLE, 2},
{ACTIVITY_BATTLE_DOUBLE, GROUPTYPE_BATTLE, 2}, {ACTIVITY_BATTLE_DOUBLE, GROUPTYPE_BATTLE, 2},
@ -382,6 +381,13 @@ static u32 CountPlayersInGroupAndGetActivity(struct RfuPlayer * player, u32 * gr
for (i = 0; i < ARRAY_COUNT(sActivityGroupInfo); i++) for (i = 0; i < ARRAY_COUNT(sActivityGroupInfo); i++)
{ {
#ifdef UBFIX
// GROUPTYPE_NONE is -1, and shouldn't be used as an index into groupCounts.
// In theory the only activity with this group type (ACTIVITY_SEARCH) wouldn't
// satisfy the condition below, but not necessarily.
if (group_type(i) == GROUPTYPE_NONE)
continue;
#endif
if (activity == group_activity(i) && player->groupScheduledAnim == UNION_ROOM_SPAWN_IN) if (activity == group_activity(i) && player->groupScheduledAnim == UNION_ROOM_SPAWN_IN)
{ {
if (group_players(i) == 0) if (group_players(i) == 0)