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BUG/MEDIUM: ring: fix creation of server in uninitialized ring

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If a "ring" section initialization fails (e.g. due to a duplicate name,
invalid chars, or missing memory), any subsequent "server" statement that
appears in the same section will crash the config parser by dereferencing
the currently NULL cfg_sink. E.g:

    ring x
    ring x                 # fails on "already exists"
       server srv 1.1.1.1  # crashes on cfg_sink==NULL

All other statements have a test for this but "server" was missing it,
so this patch adds it.

Thanks to Joel Hutchinson for reporting this issue.

This must be backported as far as 2.2.

(cherry picked from commit 1b662aabbf)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
This commit is contained in:
Willy Tarreau 2022-11-16 18:56:34 +01:00 committed by Christopher Faulet
parent abab4bd4d0
commit 857095c121
1 changed files with 6 additions and 0 deletions
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6
src/sink.c
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@ -954,6 +954,12 @@ int cfg_parse_ring(const char *file, int linenum, char **args, int kwm)
cfg_sink->ctx.ring = ring_make_from_area(area, size);
}
else if (strcmp(args[0],"server") == 0) {
if (!cfg_sink || (cfg_sink->type != SINK_TYPE_BUFFER)) {
ha_alert("parsing [%s:%d] : unable to create server '%s'.\n", file, linenum, args[1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto err;
}
err_code |= parse_server(file, linenum, args, cfg_sink->forward_px, NULL,
SRV_PARSE_PARSE_ADDR|SRV_PARSE_INITIAL_RESOLVE);
}