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BUG/MINOR: deviceatlas: fix double-checked locking race in checkinst

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In da_haproxy_checkinst(), base[0] was checked before acquiring the
lock but not re-checked after. Another thread could have already
processed the reload between the initial check and the lock
acquisition, leading to a race condition.

This should be backported to lower branches.
This commit is contained in:
David Carlier 2026-02-14 13:24:00 +00:00 committed by Willy Tarreau
parent 734a139c52
commit ea3b1bb866
1 changed files with 4 additions and 0 deletions
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4
addons/deviceatlas/da.c
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@ -280,6 +280,10 @@ static void da_haproxy_checkinst(void)
da_property_decl_t extraprops[1] = {{NULL, 0}};
#ifdef USE_THREAD
HA_SPIN_LOCK(OTHER_LOCK, &dadwsch_lock);
if (base[0] == 0) {
HA_SPIN_UNLOCK(OTHER_LOCK, &dadwsch_lock);
return;
}
#endif
strlcpy2(atlasp, base + sizeof(char), sizeof(atlasp));
jsonp = fopen(atlasp, "r");