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BUG/MAJOR: stick-counters: possible crash when using sc_trackers with wrong table

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Bryan Talbot reported a very interesting bug. The sc_trackers() sample
fetch seems to have escaped the sanitization that was performed during 1.5
to ensure all dereferences of stkctr_entry() were safe. Here if a tacker
is set on a backend and is then checked against a different backend where
the entry doesn't exist, stkctr_entry() returns NULL and this is dereferenced
to retrieve the ref count. Thanks to Bryan for his detailed bug report featuring
a working config and reproducer.

This fix must be backported to 1.6 and 1.5.
This commit is contained in:
Willy Tarreau 2016-08-14 12:02:55 +02:00
parent 597b26e432
commit 4d03ef7f03
1 changed files with 1 additions and 1 deletions
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2
src/stream.c
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@ -3262,7 +3262,7 @@ smp_fetch_sc_trackers(const struct arg *args, struct sample *smp, const char *kw
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = stkctr_entry(stkctr)->ref_cnt;
smp->data.u.sint = stkctr_entry(stkctr) ? stkctr_entry(stkctr)->ref_cnt : 0;
return 1;
}