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BUILD: lua: silence some compiler warnings about potential null derefs

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These ones are on error paths that are properly handled by luaL_error()
which does a longjmp() but the compiler cannot know it. By adding an
__unreachable() statement in WILL_LJMP(), there is no ambiguity anymore.

This may be backported to 1.8 but the previous patch (BUILD: compiler:
add a new statement "__unreachable()") is needed for this.
This commit is contained in:
Willy Tarreau 2018-10-15 11:55:18 +02:00
parent 8d26f02e69
commit f1ffb39b61
1 changed files with 7 additions and 3 deletions
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10
src/hlua.c
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@ -25,6 +25,7 @@
#include <ebpttree.h>
#include <common/cfgparse.h>
#include <common/compiler.h>
#include <common/xref.h>
#include <common/hathreads.h>
@ -67,7 +68,7 @@
* MAY_LJMP() marks an lua function that may use longjmp.
*/
#define __LJMP
#define WILL_LJMP(func) func
#define WILL_LJMP(func) do { func; __unreachable(); } while (0)
#define MAY_LJMP(func) func
/* This couple of function executes securely some Lua calls outside of
@ -2361,7 +2362,7 @@ __LJMP static int hlua_socket_connect_yield(struct lua_State *L, int status, lua
return 2;
}
appctx = objt_appctx(s->si[0].end);
appctx = __objt_appctx(s->si[0].end);
/* Check for connection established. */
if (appctx->ctx.hlua_cosocket.connected) {
@ -2473,7 +2474,7 @@ __LJMP static int hlua_socket_connect(struct lua_State *L)
}
hlua = hlua_gethlua(L);
appctx = objt_appctx(s->si[0].end);
appctx = __objt_appctx(s->si[0].end);
/* inform the stream that we want to be notified whenever the
* connection completes.
@ -5723,6 +5724,9 @@ static int hlua_register_task(lua_State *L)
WILL_LJMP(luaL_error(L, "Lua out of memory error."));
task = task_new(MAX_THREADS_MASK);
if (!task)
WILL_LJMP(luaL_error(L, "Lua out of memory error."));
task->context = hlua;
task->process = hlua_process_task;