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Fix integer overflow on for loop decrements

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This commit is contained in:
mazmazz 2018-12-22 20:17:50 -05:00
parent c7060aa5ad
commit 5badc11159
1 changed files with 8 additions and 3 deletions
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11
src/hu_stuff.c
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@ -847,10 +847,13 @@ static inline boolean HU_keyInChatString(char *s, char ch)
// move everything past c_input for new characters: // move everything past c_input for new characters:
size_t m = HU_MAXMSGLEN-1; size_t m = HU_MAXMSGLEN-1;
for (;(m>=c_input);m--) while (m>=c_input)
{ {
if (s[m]) if (s[m])
s[m+1] = (s[m]); s[m+1] = (s[m]);
if (m == 0) // prevent overflow
break;
m--;
} }
s[c_input] = ch; // and replace this. s[c_input] = ch; // and replace this.
} }
@ -1177,11 +1180,13 @@ boolean HU_Responder(event_t *ev)
else // otherwise, we need to shift everything and make space, etc etc else // otherwise, we need to shift everything and make space, etc etc
{ {
size_t i = HU_MAXMSGLEN-1; size_t i = HU_MAXMSGLEN-1;
for (; i>=c_input;i--) while (i >= c_input)
{ {
if (w_chat[i]) if (w_chat[i])
w_chat[i+pastelen] = w_chat[i]; w_chat[i+pastelen] = w_chat[i];
if (i == 0) // prevent overflow
break;
i--;
} }
memcpy(&w_chat[c_input], paste, pastelen); // copy all of that. memcpy(&w_chat[c_input], paste, pastelen); // copy all of that.
c_input += pastelen; c_input += pastelen;