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Prevent global-buffer-overflow write in formUpdateBuffer

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Bug-Debian: https://github.com/tats/w3m/issues/29
This commit is contained in:
Tatsuya Kinoshita
2016-10-08 07:06:12 +09:00
parent ec9eb22e00
commit d01de738f5
1 changed files with 3 additions and 1 deletions
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4
form.c
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@@ -442,6 +442,8 @@ formUpdateBuffer(Anchor *a, Buffer *buf, FormItemList *form)
switch (form->type) {
case FORM_INPUT_CHECKBOX:
case FORM_INPUT_RADIO:
if (spos >= buf->currentLine->len || spos < 0)
break;
if (form->checked)
buf->currentLine->lineBuf[spos] = '*';
else
@@ -485,7 +487,7 @@ formUpdateBuffer(Anchor *a, Buffer *buf, FormItemList *form)
spos = a->start.pos;
epos = a->end.pos;
}
if (a->start.line != a->end.line || spos > epos || epos >= l->len)
if (a->start.line != a->end.line || spos > epos || epos >= l->len || spos < 0 || epos < 0)
break;
pos = form_update_line(l, &p, spos, epos, COLPOS(l, epos) - col,
rows > 1,