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diff -up lua-5.4.3/lua-5.4.3-tests/cstack.lua.bug7 lua-5.4.3/lua-5.4.3-tests/cstack.lua
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--- lua-5.4.3/lua-5.4.3-tests/cstack.lua.bug7 2022-01-24 11:29:00.412334975 -0500
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+++ lua-5.4.3/lua-5.4.3-tests/cstack.lua 2022-01-24 11:32:08.101405924 -0500
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@@ -103,6 +103,20 @@ do
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end
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+do -- bug in 5.4.2
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+ print("nesting coroutines running after recoverable errors")
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+ local count = 0
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+ local function foo()
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+ count = count + 1
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+ pcall(1) -- create an error
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+ -- running now inside 'precover' ("protected recover")
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+ coroutine.wrap(foo)() -- call another coroutine
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+ end
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+ checkerror("C stack overflow", foo)
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+ print("final count: ", count)
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+end
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+
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+
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if T then
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print("testing stack recovery")
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local N = 0 -- trace number of calls
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diff -up lua-5.4.3/src/ldo.c.bug7 lua-5.4.3/src/ldo.c
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--- lua-5.4.3/src/ldo.c.bug7 2022-01-24 11:27:41.226883145 -0500
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+++ lua-5.4.3/src/ldo.c 2022-01-24 11:28:45.374249175 -0500
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@@ -728,11 +728,10 @@ static void resume (lua_State *L, void *
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StkId firstArg = L->top - n; /* first argument */
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CallInfo *ci = L->ci;
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if (L->status == LUA_OK) /* starting a coroutine? */
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- ccall(L, firstArg - 1, LUA_MULTRET, 1); /* just call its body */
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+ ccall(L, firstArg - 1, LUA_MULTRET, 0); /* just call its body */
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else { /* resuming from previous yield */
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lua_assert(L->status == LUA_YIELD);
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L->status = LUA_OK; /* mark that it is running (again) */
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- luaE_incCstack(L); /* control the C stack */
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if (isLua(ci)) { /* yielded inside a hook? */
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L->top = firstArg; /* discard arguments */
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luaV_execute(L, ci); /* just continue running Lua code */
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@@ -783,6 +782,9 @@ LUA_API int lua_resume (lua_State *L, lu
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else if (L->status != LUA_YIELD) /* ended with errors? */
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return resume_error(L, "cannot resume dead coroutine", nargs);
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L->nCcalls = (from) ? getCcalls(from) : 0;
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+ if (getCcalls(L) >= LUAI_MAXCCALLS)
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+ return resume_error(L, "C stack overflow", nargs);
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+ L->nCcalls++;
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luai_userstateresume(L, nargs);
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api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);
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status = luaD_rawrunprotected(L, resume, &nargs);
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