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fix buffer overflow when handling long composed input

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To reproduce the issue:

"
If you already have the multi-key enabled on your system, then add this line
to your ~/.XCompose file:

[...]
<question> <T> <E> <S> <T> <question> :
"1234567890123456789012345678901234567890123456789012345678901234567890"
"

Reported by and an initial patch by Andy Gozas <andy@gozas.me>, thanks!

Adapted the patch, for now st (like dmenu) handles a fixed amount of composed
characters, or otherwise ignores it. This is done for simplicity sake.
This commit is contained in:
Hiltjo Posthuma
2022-10-25 17:11:11 +02:00
parent 68d1ad9b54
commit e5e959835b
1 changed files with 6 additions and 3 deletions
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9
x.c
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@@ -1833,7 +1833,7 @@ void
kpress(XEvent *ev) kpress(XEvent *ev)
{ {
XKeyEvent *e = &ev->xkey; XKeyEvent *e = &ev->xkey;
KeySym ksym; KeySym ksym = NoSymbol;
char buf[64], *customkey; char buf[64], *customkey;
int len; int len;
Rune c; Rune c;
@@ -1843,10 +1843,13 @@ kpress(XEvent *ev)
if (IS_SET(MODE_KBDLOCK)) if (IS_SET(MODE_KBDLOCK))
return; return;
if (xw.ime.xic) if (xw.ime.xic) {
len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status); len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status);
else if (status == XBufferOverflow)
return;
} else {
len = XLookupString(e, buf, sizeof buf, &ksym, NULL); len = XLookupString(e, buf, sizeof buf, &ksym, NULL);
}
/* 1. shortcuts */ /* 1. shortcuts */
for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) { for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
if (ksym == bp->keysym && match(bp->mod, e->state)) { if (ksym == bp->keysym && match(bp->mod, e->state)) {