On Wed, Oct 26, 2022 at 03:40:28PM +0200, Ilya Maximets wrote:
> Offsets within 'rewrite' action are not 4-byte aligned, so has to
> be accessed carefully.
>
> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior lib/tc.c:1132:17 in
>
> lib/tc.c:1132:17: runtime error: store to misaligned address 0x7fba215b2025
> for type 'ovs_be32' (aka 'unsigned int'), which requires 4 byte alignment
>
> 0 0xd78857 in nl_parse_act_pedit lib/tc.c:1132:24
> 1 0xd68103 in nl_parse_single_action lib/tc.c:1936:15
> 2 0xd624ee in nl_parse_flower_actions lib/tc.c:2024:19
> 3 0xd624ee in nl_parse_flower_options lib/tc.c:2139:12
> 4 0xd5f082 in parse_netlink_to_tc_flower lib/tc.c:2187:12
> 5 0xd6a2a1 in tc_replace_flower lib/tc.c:3776:19
> 6 0xd2ae8f in netdev_tc_flow_put lib/netdev-offload-tc.c:2350:11
> 7 0x951d07 in netdev_flow_put lib/netdev-offload.c:318:14
> 8 0xcbb81a in parse_flow_put lib/dpif-netlink.c:2297:11
> 9 0xcbb81a in try_send_to_netdev lib/dpif-netlink.c:2384:15
> 10 0xcbb81a in dpif_netlink_operate lib/dpif-netlink.c:2455:23
> 11 0x8678ae in dpif_operate lib/dpif.c:1372:13
> 12 0x6bcc89 in handle_upcalls ofproto/ofproto-dpif-upcall.c:1674:5
> 13 0x6bcc89 in recv_upcalls ofproto/ofproto-dpif-upcall.c:905:9
> 14 0x6b7f9a in udpif_upcall_handler ofproto/ofproto-dpif-upcall.c:801:13
> 15 0xb54c5a in ovsthread_wrapper lib/ovs-thread.c:422:12
> 16 0x7fba2f2081ce in start_thread (/lib64/libpthread.so.0+0x81ce)
> 17 0x7fba2de39dd2 in clone (/lib64/libc.so.6+0x39dd2)
>
> Fixes: 8ada482bbe19 ("tc: Add header rewrite using tc pedit action")
> Signed-off-by: Ilya Maximets <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
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