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BUG/MAJOR: counters: check for null-deref when looking up an alternate table

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Constructions such as sc0_get_gpc0(foo) allow to look up the same key as
the current key but in an alternate table. A check was missing to ensure
we already have a key, resulting in a crash if this lookup is performed
before the associated track-sc rule.

This bug was reported on the mailing list by Neil@iamafreeman and
narrowed down further by Lukas Tribus and Thierry Fournier.

This bug was introduced in 1.5-dev20 by commit "0f791d4 MEDIUM: counters:
support looking up a key in an alternate table".
This commit is contained in:
Willy Tarreau 2014-04-09 13:25:42 +02:00
parent 25a15227f5
commit 6a0b6bd648
1 changed files with 7 additions and 2 deletions
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9
src/session.c
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@ -2639,6 +2639,7 @@ static struct stkctr *
smp_fetch_sc_stkctr(struct session *l4, const struct arg *args, const char *kw)
{
static struct stkctr stkctr;
struct stksess *stksess;
unsigned int num = kw[2] - '0';
int arg = 0;
@ -2668,13 +2669,17 @@ smp_fetch_sc_stkctr(struct session *l4, const struct arg *args, const char *kw)
* the sc[0-9]_ form, or even higher using sc_(num) if needed.
* args[arg] is the first optional argument.
*/
stksess = stkctr_entry(&l4->stkctr[num]);
if (!stksess)
return NULL;
if (unlikely(args[arg].type == ARGT_TAB)) {
/* an alternate table was specified, let's look up the same key there */
stkctr.table = &args[arg].data.prx->table;
stkctr_set_entry(&stkctr, stktable_lookup(stkctr.table, stkctr_entry(&l4->stkctr[num])));
stkctr_set_entry(&stkctr, stktable_lookup(stkctr.table, stksess));
return &stkctr;
}
return stkctr_entry(&l4->stkctr[num]) ? &l4->stkctr[num] : NULL;
return &l4->stkctr[num];
}
/* set return a boolean indicating if the requested session counter is