From 249801360db3dec4f73768c502192020bfddeacc Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 16 Aug 2022 09:19:39 -0700 Subject: net: genl: fix error path memory leak in policy dumping If construction of the array of policies fails when recording non-first policy we need to unwind. netlink_policy_dump_add_policy() itself also needs fixing as it currently gives up on error without recording the allocated pointer in the pstate pointer. Reported-by: syzbot+dc54d9ba8153b216cae0@syzkaller.appspotmail.com Fixes: 50a896cf2d6f ("genetlink: properly support per-op policy dumping") Link: https://lore.kernel.org/r/20220816161939.577583-1-kuba@kernel.org Signed-off-by: Jakub Kicinski --- net/netlink/policy.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'net/netlink/policy.c') diff --git a/net/netlink/policy.c b/net/netlink/policy.c index 8d7c900e27f4..87e3de0fde89 100644 --- a/net/netlink/policy.c +++ b/net/netlink/policy.c @@ -144,7 +144,7 @@ int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate, err = add_policy(&state, policy, maxtype); if (err) - return err; + goto err_try_undo; for (policy_idx = 0; policy_idx < state->n_alloc && state->policies[policy_idx].policy; @@ -164,7 +164,7 @@ int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate, policy[type].nested_policy, policy[type].len); if (err) - return err; + goto err_try_undo; break; default: break; @@ -174,6 +174,16 @@ int netlink_policy_dump_add_policy(struct netlink_policy_dump_state **pstate, *pstate = state; return 0; + +err_try_undo: + /* Try to preserve reasonable unwind semantics - if we're starting from + * scratch clean up fully, otherwise record what we got and caller will. + */ + if (!*pstate) + netlink_policy_dump_free(state); + else + *pstate = state; + return err; } static bool -- cgit