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Fixed bug: invalid mode can crash 'io.popen'

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This commit is contained in:
Roberto Ierusalimschy 2020-07-20 15:55:18 -03:00
parent e7411fab80
commit 092f66fb05
1 changed files with 2 additions and 0 deletions
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2
liolib.c
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@ -277,6 +277,8 @@ static int io_popen (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
LStream *p = newprefile(L);
luaL_argcheck(L, ((mode[0] == 'r' || mode[0] == 'w') && mode[1] == '\0'),
2, "invalid mode");
p->f = l_popen(L, filename, mode);
p->closef = &io_pclose;
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;