BUG/MEDIUM: map/lua: Return an error if a map is loaded during runtime

In sample_load_map() function, the global mode is now tested to be sure to be in
the starting mode. If not, an error is returned.

At first glance, this patch may seem useless because maps are loaded during the
configuration parsing. But in fact, it is possible to load a map from the lua,
using Map:new() method. And, there is nothing to forbid to call this method at
runtime, during a script execution. It must never be done because it may perform
an filesystem access for unknown maps or allocation for known ones. So at
runtime, it means a blocking call or a memroy leak. Note it is still possible to
load a map from the lua, but in the global part of a script only. This part is
executed during the configuration parsing.

This patch must be backported in all stable versions.

(cherry picked from commit 0eb967d122d3bbc682ad407bff9f21893cd25157)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit ebfb14e32803dd78da5d42f218a32ce40da8313c)
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/src/map.c b/src/map.c
index 870b2d0..72c2813 100644 (file)
--- a/src/map.c
+++ b/src/map.c
@@ -105,6 +105,11 @@ int sample_load_map(struct arg *arg, struct sample_conv *conv,
 {
        struct map_descriptor *desc;
 
+       if (!(global.mode & MODE_STARTING)) {
+               memprintf(err, "map: cannot load map at runtime");
+               return 0;
+       }
+
        /* create new map descriptor */
        desc = map_create_descriptor(conv);
        if (!desc) {