diff options
| author | Eric Dumazet <edumazet@google.com> | 2019-03-09 14:43:38 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-03-09 19:52:47 -0800 |
| commit | 083b78a9ed64bc71957dd7da866c128a307ea062 (patch) | |
| tree | 7f01e94bdceac9b22c215cc72ab204c96bed95d0 /include | |
| parent | 1039c6e1936ef2be0f342bd56fcf0fb25c1df5fe (diff) | |
ip: fix ip_mc_may_pull() return value
ip_mc_may_pull() must return 0 if there is a problem, not an errno.
syzbot reported :
BUG: KASAN: use-after-free in br_ip4_multicast_igmp3_report net/bridge/br_multicast.c:947 [inline]
BUG: KASAN: use-after-free in br_multicast_ipv4_rcv net/bridge/br_multicast.c:1631 [inline]
BUG: KASAN: use-after-free in br_multicast_rcv+0x3cd8/0x4440 net/bridge/br_multicast.c:1741
Read of size 4 at addr ffff88820a4084ee by task syz-executor.2/11183
CPU: 1 PID: 11183 Comm: syz-executor.2 Not tainted 5.0.0+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
__asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
br_ip4_multicast_igmp3_report net/bridge/br_multicast.c:947 [inline]
br_multicast_ipv4_rcv net/bridge/br_multicast.c:1631 [inline]
br_multicast_rcv+0x3cd8/0x4440 net/bridge/br_multicast.c:1741
br_handle_frame_finish+0xa3a/0x14c0 net/bridge/br_input.c:108
br_nf_hook_thresh+0x2ec/0x380 net/bridge/br_netfilter_hooks.c:1005
br_nf_pre_routing_finish+0x8e2/0x1750 net/bridge/br_netfilter_hooks.c:410
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
br_nf_pre_routing+0x7e7/0x13a0 net/bridge/br_netfilter_hooks.c:506
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xbf/0x1f0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:244 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
br_handle_frame+0x95b/0x1450 net/bridge/br_input.c:305
__netif_receive_skb_core+0xa96/0x3040 net/core/dev.c:4902
__netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:4971
__netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
netif_receive_skb_internal+0x117/0x660 net/core/dev.c:5186
netif_receive_skb+0x6e/0x5a0 net/core/dev.c:5261
Fixes: ba5ea614622d ("bridge: simplify ip_mc_check_igmp() and ipv6_mc_check_mld() calls")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/igmp.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/igmp.h b/include/linux/igmp.h index cc85f4524dbf..9c94b2ea789c 100644 --- a/include/linux/igmp.h +++ b/include/linux/igmp.h @@ -110,7 +110,7 @@ struct ip_mc_list { static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) { if (skb_transport_offset(skb) + ip_transport_len(skb) < len) - return -EINVAL; + return 0; return pskb_may_pull(skb, len); } |