diff options
| author | Davide Caratti | 2021-04-26 17:45:51 +0200 |
|---|---|---|
| committer | David S. Miller | 2021-04-26 13:06:39 -0700 |
| commit | f77bd544a6bbe69aa50d9ed09f13494cf36ff806 (patch) | |
| tree | 9ef9579f193f1f93bda6b0439b32595d06128414 /drivers | |
| parent | 63fa73e2151848ed5930dfe0040c823ffe1f2cc4 (diff) | |
net/sched: act_ct: fix wild memory access when clearing fragments
while testing re-assembly/re-fragmentation using act_ct, it's possible to
observe a crash like the following one:
KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f]
CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S 5.12.0-rc7+ #424
Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017
RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0
Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48
RSP: 0018:ffff888c31449db8 EFLAGS: 00010203
RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960
RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e
RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350
R10: 0000000000000003 R11: ffffed1186289350 R12: dffffc0000000000
R13: 000100000000040e R14: 0000000000000000 R15: ffff888155e02160
FS: 0000000000000000(0000) GS:ffff888c31440000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005600cb70a5b8 CR3: 0000000a2c014005 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
inet_frag_destroy+0xa9/0x150
call_timer_fn+0x2d/0x180
run_timer_softirq+0x4fe/0xe70
__do_softirq+0x197/0x5a0
irq_exit_rcu+0x1de/0x200
sysvec_apic_timer_interrupt+0x6b/0x80
</IRQ>
when act_ct temporarily stores an IP fragment, restoring the skb qdisc cb
results in putting random data in FRAG_CB(), and this causes those "wild"
memory accesses later, when the rbtree is purged. Never overwrite the skb
cb in case tcf_ct_handle_fragments() returns -EINPROGRESS.
Fixes: ae372cb1750f ("net/sched: act_ct: fix restore the qdisc_skb_cb after defrag")
Fixes: 7baf2429a1a9 ("net/sched: cls_flower add CT_FLAGS_INVALID flag support")
Reported-by: Shuang Li <shuali@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions