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05 April 2024, 19:05:47 UTC
Revision d7aa04a5e82b4f254d306926c81eae8df69e5200 authored by Roman Kapl on 20 November 2017, 21:21:13 UTC, committed by David S. Miller on 23 November 2017, 16:25:37 UTC 
net: sched: fix crash when deleting secondary chains
 
If you flush (delete) a filter chain other than chain 0 (such as when
deleting the device), the kernel may run into a use-after-free. The
chain refcount must not be decremented unless we are sure we are done
with the chain.

To reproduce the bug, run:
    ip link add dtest type dummy
    tc qdisc add dev dtest ingress
    tc filter add dev dtest chain 1  parent ffff: flower
    ip link del dtest

Introduced in: commit f93e1cdcf42c ("net/sched: fix filter flushing"),
but unless you have KAsan or luck, you won't notice it until
commit 0dadc117ac8b ("cls_flower: use tcf_exts_get_net() before call_rcu()")

Fixes: f93e1cdcf42c ("net/sched: fix filter flushing")
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Roman Kapl <code@rkapl.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 0cc0350
History
Tip revision: d7aa04a5e82b4f254d306926c81eae8df69e5200 authored by Roman Kapl on 20 November 2017, 21:21:13 UTC
net: sched: fix crash when deleting secondary chains
Tip revision: d7aa04a
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.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitattributes -rw-r--r-- 30 bytes
.gitignore -rw-r--r-- 1.4 KB
.mailmap -rw-r--r-- 8.8 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 96.2 KB
Kbuild -rw-r--r-- 2.2 KB
Kconfig -rw-r--r-- 287 bytes
MAINTAINERS -rw-r--r-- 425.7 KB
Makefile -rw-r--r-- 58.2 KB
README -rw-r--r-- 722 bytes

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