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Date: Mon, 07 May 2018 16:07:24 +0000 From: bugzilla-dae...@bugzilla.kernel.org To: step...@networkplumber.org Subject: [Bug 199637] New: UBSAN: Undefined behaviour in net/ipv4/fib_trie.c:503:6 https://bugzilla.kernel.org/show_bug.cgi?id=199637 Bug ID: 199637 Summary: UBSAN: Undefined behaviour in net/ipv4/fib_trie.c:503:6 Product: Networking Version: 2.5 Kernel Version: 4.16.7 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: IPV4 Assignee: step...@networkplumber.org Reporter: combus...@archlinux.us Regression: No After recompiling the 4.16.7 kernel with gcc 8.1, UBSAN reports the following: [ 25.427424] ================================================================================ [ 25.429680] UBSAN: Undefined behaviour in net/ipv4/fib_trie.c:503:6 [ 25.431920] member access within null pointer of type 'struct tnode' [ 25.434153] CPU: 3 PID: 1 Comm: systemd Not tainted 4.16.7-CUSTOM #1 [ 25.436384] Hardware name: Gigabyte Technology Co., Ltd. H67MA-UD2H-B3/H67MA-UD2H-B3, BIOS F8 03/27/2012 [ 25.438647] Call Trace: [ 25.440889] dump_stack+0x62/0x9f [ 25.443104] ubsan_epilogue+0x9/0x35 [ 25.445293] handle_null_ptr_deref+0x80/0x90 [ 25.447464] __ubsan_handle_type_mismatch_v1+0x6a/0x80 [ 25.449628] tnode_free+0xce/0x120 [ 25.451749] ? replace+0xa0/0x1f0 [ 25.453833] ? resize+0x4e2/0xb70 [ 25.455916] ? __kmalloc+0x1fe/0x2d0 [ 25.457997] ? tnode_new+0x66/0x160 [ 25.460072] ? fib_insert_alias+0x4a8/0x9e0 [ 25.462145] ? fib_table_insert+0x208/0x690 [ 25.464214] ? fib_magic+0x20c/0x310 [ 25.466280] ? fib_netdev_event+0x81/0x200 [ 25.468339] ? notifier_call_chain+0x63/0x110 [ 25.470407] ? __dev_notify_flags+0xa8/0x170 [ 25.472472] ? dev_change_flags+0x56/0x80 [ 25.474538] ? do_setlink+0x3c2/0x1a00 [ 25.476603] ? fib_magic+0x20c/0x310 [ 25.478666] ? rtnl_setlink+0x129/0x1e0 [ 25.480728] ? rtnetlink_rcv_msg+0x2a4/0x7d0 [ 25.482765] ? rtnetlink_rcv+0x10/0x10 [ 25.484757] ? netlink_rcv_skb+0x6f/0x170 [ 25.486741] ? netlink_unicast+0x1c0/0x2d0 [ 25.488716] ? netlink_sendmsg+0x2c1/0x630 [ 25.490661] ? sock_sendmsg+0x49/0xb0 [ 25.492564] ? SyS_sendto+0x12b/0x1d0 [ 25.494449] ? do_syscall_64+0xad/0x5cc [ 25.496305] ? page_fault+0x2f/0x50 [ 25.498140] ? entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 25.499974] ================================================================================ UBSAN reported nothing when the same kernel was compiled with gcc 7.3.1 from Arch Linux repositories. I have three more similar reports to make, if I continue to c/p in each I'm gonna feel like a fuzzbot... -- You are receiving this mail because: You are the assignee for the bug.
