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[ Upstream commit34a4c95abd] BH must be disabled when invoking nf_conncount_gc_list() to perform garbage collection, otherwise deadlock might happen. nf_conncount_add+0x1f/0x50 [nf_conncount] nft_connlimit_eval+0x4c/0xe0 [nft_connlimit] nft_dynset_eval+0xb5/0x100 [nf_tables] nft_do_chain+0xea/0x420 [nf_tables] ? sch_direct_xmit+0x111/0x360 ? noqueue_init+0x10/0x10 ? __qdisc_run+0x84/0x510 ? tcp_packet+0x655/0x1610 [nf_conntrack] ? ip_finish_output2+0x1a7/0x430 ? tcp_error+0x130/0x150 [nf_conntrack] ? nf_conntrack_in+0x1fc/0x4c0 [nf_conntrack] nft_do_chain_ipv4+0x66/0x80 [nf_tables] nf_hook_slow+0x44/0xc0 ip_rcv+0xb5/0xd0 ? ip_rcv_finish_core.isra.19+0x360/0x360 __netif_receive_skb_one_core+0x52/0x70 netif_receive_skb_internal+0x34/0xe0 napi_gro_receive+0xba/0xe0 e1000_clean_rx_irq+0x1e9/0x420 [e1000e] e1000e_poll+0xbe/0x290 [e1000e] net_rx_action+0x149/0x3b0 __do_softirq+0xde/0x2d8 irq_exit+0xba/0xc0 do_IRQ+0x85/0xd0 common_interrupt+0xf/0xf </IRQ> RIP: 0010:nf_conncount_gc_list+0x3b/0x130 [nf_conncount] Fixes:2f971a8f42("netfilter: nf_conncount: move all list iterations under spinlock") Reported-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.