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In P_HandleSharedKeys(), clean up weapon index bound checking.

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In particular, (int32_t)j != -1 is replaced by (uint32_t)j < MAX_WEAPONS
to prevent a value >= MAX_WEAPONS to be assigned to p->wantweaponfire (it's
used as a weapon index in P_CheckWeapon().

git-svn-id: https://svn.eduke32.com/eduke32@4181 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2013-11-28 21:18:05 +00:00
parent 8ab35ec520
commit 7350e1cfa0
1 changed files with 9 additions and 2 deletions
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11
polymer/eduke32/source/sector.c
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@ -2689,13 +2689,19 @@ CHECKINV1:
break;
}
// NOTE: it is assumed that the above events return either -1 or a
// valid weapon index. Presumably, neither other negative numbers nor
// positive ones >= MAX_WEAPONS are allowed. However, the code below is
// a bit inconsistent in checking "j".
if (p->reloading == 1)
j = -1;
else if ((int32_t)j != -1 && p->kickback_pic == 1 && p->weapon_pos == 1)
else if ((uint32_t)j < MAX_WEAPONS && p->kickback_pic == 1 && p->weapon_pos == 1)
{
p->wantweaponfire = j;
p->kickback_pic = 0;
}
if ((int32_t)j != -1 && p->last_pissed_time <= (GAMETICSPERSEC*218) && p->show_empty_weapon == 0 /*&& p->kickback_pic == 0*/ &&
p->quick_kick == 0 && sprite[p->i].xrepeat > 32 && p->access_incs == 0 && p->knee_incs == 0)
{
@ -2763,6 +2769,7 @@ CHECKINV1:
j = VM_OnEvent(EVENT_SELECTWEAPON,p->i,snum, -1, j);
// XXX: any signifcance to "<= MAX_WEAPONS" instead of "<"?
if ((int32_t)j != -1 && j <= MAX_WEAPONS)
{
if (j == HANDBOMB_WEAPON && p->ammo_amount[HANDBOMB_WEAPON] == 0)
@ -2813,7 +2820,7 @@ CHECKINV1:
sb_snum |= BIT(SK_HOLSTER);
p->weapon_pos = WEAPON_POS_LOWER;
}
else if ((int32_t)j >= 0 && (p->gotweapon & (1<<j)) && (uint32_t)p->curr_weapon != j)
else if ((uint32_t)j < MAX_WEAPONS && (p->gotweapon & (1<<j)) && (uint32_t)p->curr_weapon != j)
switch (j)
{
case PISTOL_WEAPON: