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Astobj2: Correctly treat hash_fn returning INT_MIN

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The code in astobj2_hash.c wrongly assumed that abs(int) is always > 0.
However, abs(INT_MIN) = INT_MIN and is still negative, as well as
abs(INT_MIN) % num_buckets, and as a result this led to a crash.

One way to trigger the bug is using host=::80 or 0.0.0.128 in peer
configuration section in chan_sip or chan_iax.

This patch takes the remainder before applying abs, so that bucket
number is always in range.

ASTERISK-25100 #close
Reported by: Mark Petersen

Change-Id: Id6981400ad526f47e10bcf7b847b62bd2785e899
This commit is contained in:
Ivan Poddubny
2015-05-24 21:47:16 +03:00
parent 8f431d679f
commit f9877139df
1 changed files with 2 additions and 3 deletions
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5
main/astobj2.c
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@@ -900,7 +900,7 @@ static struct bucket_entry *internal_ao2_link(struct ao2_container *c, void *use
return NULL;
}
i = abs(c->hash_fn(user_data, OBJ_POINTER));
i = abs(c->hash_fn(user_data, OBJ_POINTER) % c->n_buckets);
if (flags & OBJ_NOLOCK) {
orig_lock = adjust_lock(c, AO2_LOCK_REQ_WRLOCK, 1);
@@ -909,7 +909,6 @@ static struct bucket_entry *internal_ao2_link(struct ao2_container *c, void *use
orig_lock = AO2_LOCK_REQ_MUTEX;
}
i %= c->n_buckets;
p->astobj = obj;
p->version = ast_atomic_fetchadd_int(&c->version, 1);
AST_LIST_INSERT_TAIL(&c->buckets[i], p, entry);
@@ -1065,7 +1064,7 @@ static void *internal_ao2_callback(struct ao2_container *c, enum search_flags fl
*/
if ((flags & (OBJ_POINTER | OBJ_KEY))) {
/* we know hash can handle this case */
start = i = c->hash_fn(arg, flags & (OBJ_POINTER | OBJ_KEY)) % c->n_buckets;
start = i = abs(c->hash_fn(arg, flags & (OBJ_POINTER | OBJ_KEY)) % c->n_buckets);
} else {
/* don't know, let's scan all buckets */
start = i = -1; /* XXX this must be fixed later. */