Lock RCU before calling ip6mr_get_table() in several ip6mr functions.

v5:
  - add missing RCU locks in ip6mr_new_table(), ip6mr_mfc_seq_start(),
    ip6_mroute_setsockopt(), ip6_mroute_getsockopt() and
    ip6mr_rtm_getroute()
  - fix double RCU unlock in ip6mr_compat_ioctl()
  - always jump to out label in ip6mr_ioctl()
v4: https://patchwork.kernel.org/project/netdevbpf/cover/20241011074811.2308043-3-stefan.wiehler@nokia.com/
  - mention in commit message that ip6mr_vif_seq_stop() would be called
    in case ip6mr_vif_seq_start() returns an error
  - fix unitialised use of mrt variable
  - revert commit b6dd5acde3f1 ("ipv6: Fix suspicious RCU usage warning
    in ip6mr")
v3: https://patchwork.kernel.org/project/netdevbpf/patch/20241010090741.1980100-2-stefan.wiehler@nokia.com/
  - split into separate patches
v2: https://patchwork.kernel.org/project/netdevbpf/patch/20241001100119.230711-2-stefan.wiehler@nokia.com/
  - rebase on top of net tree
  - add Fixes tag
  - refactor out paths
v1: https://patchwork.kernel.org/project/netdevbpf/patch/20240605195355.363936-1-oss@malat.biz/

Stefan Wiehler (10):
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_vif_seq_start()
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_ioctl()
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_compat_ioctl()
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_get_route()
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_new_table()
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_mfc_seq_start()
  ip6mr: Lock RCU before ip6mr_get_table() call in
    ip6_mroute_setsockopt()
  ip6mr: Lock RCU before ip6mr_get_table() call in
    ip6_mroute_getsockopt()
  ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_rtm_getroute()
  Revert "ipv6: Fix suspicious RCU usage warning in ip6mr"

 net/ipv6/ip6mr.c | 125 ++++++++++++++++++++++++++++++-----------------
 1 file changed, 80 insertions(+), 45 deletions(-)

-- 
2.42.0

On Mon, 14 Oct 2024 17:05:46 +0200 Stefan Wiehler wrote:
> v2: https://patchwork.kernel.org/project/netdevbpf/patch/20241001100119.230711-2-stefan.wiehler@nokia.com/
>   - rebase on top of net tree
>   - add Fixes tag
>   - refactor out paths

Please add the relevant info (from patch 2?) to the cover letter.
Otherwise it's hard to figure out at a glance what this series is
fixing.