Hi, thanks for your reply! On Wed, 2021-03-03 at 21:40 -0500, Alexander Aring wrote: > Hi, > > On Wed, 3 Mar 2021 at 11:28, Pavel Skripkin <paskripkin@xxxxxxxxx> > wrote: > > syzbot found general protection fault in crypto_destroy_tfm()[1]. > > It was caused by wrong clean up loop in llsec_key_alloc(). > > If one of the tfm array members won't be initialized it will cause > > NULL dereference in crypto_destroy_tfm(). > > > > Call Trace: > > crypto_free_aead include/crypto/aead.h:191 [inline] [1] > > llsec_key_alloc net/mac802154/llsec.c:156 [inline] > > mac802154_llsec_key_add+0x9e0/0xcc0 net/mac802154/llsec.c:249 > > ieee802154_add_llsec_key+0x56/0x80 net/mac802154/cfg.c:338 > > rdev_add_llsec_key net/ieee802154/rdev-ops.h:260 [inline] > > nl802154_add_llsec_key+0x3d3/0x560 net/ieee802154/nl802154.c:1584 > > genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 > > genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] > > genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 > > netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 > > genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 > > netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] > > netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 > > netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 > > sock_sendmsg_nosec net/socket.c:654 [inline] > > sock_sendmsg+0xcf/0x120 net/socket.c:674 > > ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 > > ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 > > __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 > > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > > entry_SYSCALL_64_after_hwframe+0x44/0xae > > > > Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx> > > Reported-by: syzbot+12cf5fbfdeba210a89dd@xxxxxxxxxxxxxxxxxxxxxxxxx > > --- > > net/mac802154/llsec.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/net/mac802154/llsec.c b/net/mac802154/llsec.c > > index 585d33144c33..6709f186f777 100644 > > --- a/net/mac802154/llsec.c > > +++ b/net/mac802154/llsec.c > > @@ -151,7 +151,7 @@ llsec_key_alloc(const struct > > ieee802154_llsec_key *template) > > err_tfm0: > > crypto_free_sync_skcipher(key->tfm0); > > err_tfm: > > - for (i = 0; i < ARRAY_SIZE(key->tfm); i++) > > + for (; i >= 0; i--) > > if (key->tfm[i]) > > I think this need to be: > > if (!IS_ERR_OR_NULL(key->tfm[i])) > > otherwise we still run into issues for the current iterator when > key->tfm[i] is in range of IS_ERR(). Oh... I got it completly wrong, I'm sorry. If it's still not fixed, I'll send rigth patch for that. > > - Alex -- With regards, Pavel Skripkin
