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vim-patch:8.2.3595: check for signed overflow might not work everywhere

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Problem:    Check for signed overflow might not work everywhere.
Solution:   Limit to 32 bit int. (closes vim/vim#9043, closes vim/vim#9067)
0d5a12ea04
This commit is contained in:
zeertzjq 2022-04-27 12:37:34 +08:00
parent 4531ddaa62
commit 096923e990
1 changed files with 5 additions and 5 deletions
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10
src/nvim/getchar.c
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@ -872,10 +872,8 @@ void init_default_mappings(void)
int ins_typebuf(char_u *str, int noremap, int offset, bool nottyped, bool silent)
{
char_u *s1, *s2;
int newlen;
int addlen;
int i;
int newoff;
int val;
int nrm;
@ -901,13 +899,15 @@ int ins_typebuf(char_u *str, int noremap, int offset, bool nottyped, bool silent
// In typebuf.tb_buf there must always be room for 3 * (MAXMAPLEN + 4)
// characters. We add some extra room to avoid having to allocate too
// often.
newoff = MAXMAPLEN + 4;
newlen = typebuf.tb_len + addlen + newoff + 4 * (MAXMAPLEN + 4);
if (newlen < 0) { // string is getting too long
int newoff = MAXMAPLEN + 4;
int extra = addlen + newoff + 4 * (MAXMAPLEN + 4);
if (typebuf.tb_len > 2147483674 - extra) {
// string is getting too long for 32 bit int
emsg(_(e_toocompl)); // also calls flush_buffers
setcursor();
return FAIL;
}
int newlen = typebuf.tb_len + extra;
s1 = xmalloc((size_t)newlen);
s2 = xmalloc((size_t)newlen);
typebuf.tb_buflen = newlen;