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patch 8.2.3244: Lua 5.3 print() with a long string crashes

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Problem:    Lua 5.3 print() with a long string crashes.
Solution:   Use a growarray instead of a Lua buffer. (Yegappan Lakshmanan,
            closes #8655)
This commit is contained in:
Yegappan Lakshmanan
2021-07-29 20:22:14 +02:00
committed by Bram Moolenaar
parent 83cd0156e0
commit 41114a2a27
4 changed files with 34 additions and 8 deletions
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23
src/if_lua.c
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@@ -1720,11 +1720,12 @@ static const luaL_Reg luaV_Window_mt[] = {
static int
luaV_print(lua_State *L)
{
int i, n = lua_gettop(L); // nargs
const char *s;
size_t l;
luaL_Buffer b;
luaL_buffinit(L, &b);
int i, n = lua_gettop(L); // nargs
const char *s;
size_t l;
garray_T msg_ga;
ga_init2(&msg_ga, 1, 128);
lua_getglobal(L, "tostring");
for (i = 1; i <= n; i++)
{
@@ -1735,13 +1736,19 @@ luaV_print(lua_State *L)
if (s == NULL)
return luaL_error(L, "cannot convert to string");
if (i > 1)
luaL_addchar(&b, ' '); // use space instead of tab
luaV_addlstring(&b, s, l, 0);
ga_append(&msg_ga, ' '); // use space instead of tab
ga_concat_len(&msg_ga, (char_u *)s, l);
lua_pop(L, 1);
}
luaL_pushresult(&b);
// Replace any "\n" with "\0"
for (i = 0; i < msg_ga.ga_len; i++)
if (((char *)msg_ga.ga_data)[i] == '\n')
((char *)msg_ga.ga_data)[i] = '\0';
lua_pushlstring(L, msg_ga.ga_data, msg_ga.ga_len);
if (!got_int)
luaV_msg(L);
ga_clear(&msg_ga);
return 0;
}