From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Jon Maloy <jmaloy@redhat.com>,
Hoang Le <hoang.h.le@dektech.com.au>,
Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH 5.4 30/33] tipc: fix NULL deref in tipc_link_xmit()
Date: Fri, 22 Jan 2021 15:12:46 +0100 [thread overview]
Message-ID: <20210122135734.787814821@linuxfoundation.org> (raw)
In-Reply-To: <20210122135733.565501039@linuxfoundation.org>
From: Hoang Le <hoang.h.le@dektech.com.au>
[ Upstream commit b77413446408fdd256599daf00d5be72b5f3e7c6 ]
The buffer list can have zero skb as following path:
tipc_named_node_up()->tipc_node_xmit()->tipc_link_xmit(), so
we need to check the list before casting an &sk_buff.
Fault report:
[] tipc: Bulk publication failure
[] general protection fault, probably for non-canonical [#1] PREEMPT [...]
[] KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
[] CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted 5.10.0-rc4+ #2
[] Hardware name: Bochs ..., BIOS Bochs 01/01/2011
[] RIP: 0010:tipc_link_xmit+0xc1/0x2180
[] Code: 24 b8 00 00 00 00 4d 39 ec 4c 0f 44 e8 e8 d7 0a 10 f9 48 [...]
[] RSP: 0018:ffffc90000006ea0 EFLAGS: 00010202
[] RAX: dffffc0000000000 RBX: ffff8880224da000 RCX: 1ffff11003d3cc0d
[] RDX: 0000000000000019 RSI: ffffffff886007b9 RDI: 00000000000000c8
[] RBP: ffffc90000007018 R08: 0000000000000001 R09: fffff52000000ded
[] R10: 0000000000000003 R11: fffff52000000dec R12: ffffc90000007148
[] R13: 0000000000000000 R14: 0000000000000000 R15: ffffc90000007018
[] FS: 0000000000000000(0000) GS:ffff888037400000(0000) knlGS:000[...]
[] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[] CR2: 00007fffd2db5000 CR3: 000000002b08f000 CR4: 00000000000006f0
Fixes: af9b028e270fd ("tipc: make media xmit call outside node spinlock context")
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Link: https://lore.kernel.org/r/20210108071337.3598-1-hoang.h.le@dektech.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/tipc/link.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -939,9 +939,7 @@ void tipc_link_reset(struct tipc_link *l
int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
struct sk_buff_head *xmitq)
{
- struct tipc_msg *hdr = buf_msg(skb_peek(list));
unsigned int maxwin = l->window;
- int imp = msg_importance(hdr);
unsigned int mtu = l->mtu;
u16 ack = l->rcv_nxt - 1;
u16 seqno = l->snd_nxt;
@@ -950,8 +948,14 @@ int tipc_link_xmit(struct tipc_link *l,
struct sk_buff_head *backlogq = &l->backlogq;
struct sk_buff *skb, *_skb, **tskb;
int pkt_cnt = skb_queue_len(list);
+ struct tipc_msg *hdr;
int rc = 0;
+ int imp;
+ if (pkt_cnt <= 0)
+ return 0;
+
+ hdr = buf_msg(skb_peek(list));
if (unlikely(msg_size(hdr) > mtu)) {
pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n",
skb_queue_len(list), msg_user(hdr),
@@ -960,6 +964,7 @@ int tipc_link_xmit(struct tipc_link *l,
return -EMSGSIZE;
}
+ imp = msg_importance(hdr);
/* Allow oversubscription of one data msg per source at congestion */
if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) {
if (imp == TIPC_SYSTEM_IMPORTANCE) {
next prev parent reply other threads:[~2021-01-22 18:36 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-22 14:12 [PATCH 5.4 00/33] 5.4.92-rc1 review Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 01/33] usb: ohci: Make distrust_firmware param default to false Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 02/33] compiler.h: Raise minimum version of GCC to 5.1 for arm64 Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 03/33] xen/privcmd: allow fetching resource sizes Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 04/33] elfcore: fix building with clang Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 05/33] scsi: lpfc: Make function lpfc_defer_pt2pt_acc static Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 06/33] scsi: lpfc: Make lpfc_defer_acc_rsp static Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 07/33] spi: npcm-fiu: simplify the return expression of npcm_fiu_probe() Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 08/33] spi: npcm-fiu: Disable clock in probe error path Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 09/33] nfsd4: readdirplus shouldnt return parent of export Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 10/33] bpf: Dont leak memory in bpf getsockopt when optlen == 0 Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 11/33] bpf: Fix helper bpf_map_peek_elem_proto pointing to wrong callback Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 12/33] udp: Prevent reuseport_select_sock from reading uninitialized socks Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 13/33] netxen_nic: fix MSI/MSI-x interrupts Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 14/33] net: introduce skb_list_walk_safe for skb segment walking Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 15/33] net: skbuff: disambiguate argument and member for skb_list_walk_safe helper Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 16/33] net: ipv6: Validate GSO SKB before finish IPv6 processing Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 17/33] mlxsw: core: Add validation of transceiver temperature thresholds Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 18/33] mlxsw: core: Increase critical threshold for ASIC thermal zone Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 19/33] net: mvpp2: Remove Pause and Asym_Pause support Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 20/33] rndis_host: set proper input size for OID_GEN_PHYSICAL_MEDIUM request Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 21/33] esp: avoid unneeded kmap_atomic call Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 22/33] net: dcb: Validate netlink message in DCB handler Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 23/33] net: dcb: Accept RTM_GETDCB messages carrying set-like DCB commands Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 24/33] rxrpc: Call state should be read with READ_ONCE() under some circumstances Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 25/33] net: stmmac: Fixed mtu channged by cache aligned Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 26/33] net: sit: unregister_netdevice on newlinks error path Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 27/33] net: avoid 32 x truesize under-estimation for tiny skbs Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 28/33] rxrpc: Fix handling of an unsupported token type in rxrpc_read() Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 29/33] net, sctp, filter: remap copy_from_user failure error Greg Kroah-Hartman
2021-01-22 16:55 ` Marcelo Ricardo Leitner
2021-01-23 14:57 ` Greg Kroah-Hartman
2021-01-22 14:12 ` Greg Kroah-Hartman [this message]
2021-01-22 14:12 ` [PATCH 5.4 31/33] mac80211: do not drop tx nulldata packets on encrypted links Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 32/33] mac80211: check if atf has been disabled in __ieee80211_schedule_txq Greg Kroah-Hartman
2021-01-22 14:12 ` [PATCH 5.4 33/33] spi: cadence: cache reference clock rate during probe Greg Kroah-Hartman
2021-01-23 0:24 ` [PATCH 5.4 00/33] 5.4.92-rc1 review Shuah Khan
2021-01-23 5:57 ` Naresh Kamboju
2021-01-23 7:20 ` Naresh Kamboju
2021-01-23 9:59 ` Jon Hunter
2021-01-23 14:35 ` Guenter Roeck
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