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4f4afc07dc
Commit4ce5dc9316("inet: switch inet_dump_fib() to RCU protection") allowed IPv4 FIB dumps to run concurrently with nexthop replacement. fib_dump_info_fnhe() uses fib_info_num_path() as the loop bound, then fib_info_nhc() independently reloads nh->nh_grp. If RTM_NEWNEXTHOP replaces a group with fewer paths between those loads, fib_info_nhc() returns NULL and the dump dereferences it through nhc_flags. Stop the walk when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path. Fixes:4ce5dc9316("inet: switch inet_dump_fib() to RCU protection") Reported-by: Ido Schimmel <idosch@nvidia.com> Link: https://lore.kernel.org/netdev/20261001170513.GA1657889@shredder/ Cc: stable@vger.kernel.org Signed-off-by: Daehyeon Ko <4ncienth@gmail.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/5bb7bd97411eb9db454464bf449107395e760f26.1790915964.git.4ncienth@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
3833 lines
97 KiB
3833 lines
97 KiB