| Message ID | 20230124020106.743966-5-jk@codeconstruct.com.au (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | b98e1a04e27fddfdc808bf46fe78eca30db89ab3 |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: mctp: struct sock lifetime fixes | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Clearly marked for net |
| netdev/fixes_present | success | Fixes tag present in non-next series |
| netdev/subject_prefix | success | Link |
| netdev/cover_letter | success | Series has a cover letter |
| netdev/patch_count | success | Link |
| netdev/header_inline | success | No static functions without inline keyword in header files |
| netdev/build_32bit | success | Errors and warnings before: 4 this patch: 4 |
| netdev/cc_maintainers | success | CCed 7 of 7 maintainers |
| netdev/build_clang | success | Errors and warnings before: 1 this patch: 1 |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Signed-off-by tag matches author and committer |
| netdev/check_selftest | success | No net selftest shell script |
| netdev/verify_fixes | success | Fixes tag looks correct |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 4 this patch: 4 |
| netdev/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 25 lines checked |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/source_inline | success | Was 0 now: 0 |
diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c index fb6ae3110528..45bbe3e54cc2 100644 --- a/net/mctp/af_mctp.c +++ b/net/mctp/af_mctp.c @@ -577,6 +577,7 @@ static void mctp_sk_unhash(struct sock *sk) spin_lock_irqsave(&key->lock, fl2); __mctp_key_remove(key, net, fl2, MCTP_TRACE_KEY_CLOSED); } + sock_set_flag(sk, SOCK_DEAD); spin_unlock_irqrestore(&net->mctp.keys_lock, flags); /* Since there are no more tag allocations (we have removed all of the diff --git a/net/mctp/route.c b/net/mctp/route.c index 06c0de21984d..f51a05ec7162 100644 --- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -179,6 +179,11 @@ static int mctp_key_add(struct mctp_sk_key *key, struct mctp_sock *msk) spin_lock_irqsave(&net->mctp.keys_lock, flags); + if (sock_flag(&msk->sk, SOCK_DEAD)) { + rc = -EINVAL; + goto out_unlock; + } + hlist_for_each_entry(tmp, &net->mctp.keys, hlist) { if (mctp_key_match(tmp, key->local_addr, key->peer_addr, key->tag)) { @@ -200,6 +205,7 @@ static int mctp_key_add(struct mctp_sk_key *key, struct mctp_sock *msk) hlist_add_head(&key->sklist, &msk->keys); } +out_unlock: spin_unlock_irqrestore(&net->mctp.keys_lock, flags); return rc;
Once a socket has been unhashed, we want to prevent it from being re-used in a sk_key entry as part of a routing operation. This change marks the sk as SOCK_DEAD on unhash, which prevents addition into the net's key list. We need to do this during the key add path, rather than key lookup, as we release the net keys_lock between those operations. Fixes: 4a992bbd3650 ("mctp: Implement message fragmentation & reassembly") Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> --- net/mctp/af_mctp.c | 1 + net/mctp/route.c | 6 ++++++ 2 files changed, 7 insertions(+)