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BUG/MINOR: map/cli: protect the backref list during "show map" errors

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In case of write error in "show map", the backref is detached but
the list wasn't locked when this is done. The risk is very low but
it may happen that two concurrent "show map" one of which would fail
or one "show map" failing while the same entry is being updated could
cause a crash.

This should be backported to all stable versions.
This commit is contained in:
Willy Tarreau 2022-05-03 15:19:49 +02:00
parent 4f9f157537
commit 2edaace575
1 changed files with 2 additions and 0 deletions
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2
src/map.c
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@ -332,10 +332,12 @@ static int cli_io_handler_pat_list(struct appctx *appctx)
* reference to the last ref_elt being dumped.
*/
if (appctx->st2 == STAT_ST_LIST) {
HA_SPIN_LOCK(PATREF_LOCK, &appctx->ctx.map.ref->lock);
if (!LIST_ISEMPTY(&appctx->ctx.map.bref.users)) {
LIST_DELETE(&appctx->ctx.map.bref.users);
LIST_INIT(&appctx->ctx.map.bref.users);
}
HA_SPIN_UNLOCK(PATREF_LOCK, &appctx->ctx.map.ref->lock);
}
return 1;
}