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Check length of format option before accessing

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This commit is contained in:
dmiller
2025-07-15 18:23:47 +00:00
parent d91d876905
commit c40965039b
1 changed files with 4 additions and 1 deletions
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5
nse_zlib.cc
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@@ -564,7 +564,10 @@ static int lzstream_decompress(lua_State *L) {
success = (l == 0) ? lz_test_eof(L, s) : lz_read_chars(L, s, l); success = (l == 0) ? lz_test_eof(L, s) : lz_read_chars(L, s, l);
} }
else { else {
const char *p = lua_tostring(L, n); size_t l;
const char *p = lua_tolstring(L, n, &l);
if (l < 2)
return luaL_argerror(L, n, "invalid format");
luaL_argcheck(L, p && p[0] == '*', n, "invalid option"); luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
switch (p[1]) { switch (p[1]) {
case 'l': /* line */ case 'l': /* line */