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ktls: Check for a NULL send tag in ktls_cleanup()

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When using ifnet ktls, and when ktls_reset_send_tag()
fails to allocate a replacement tag, it leaves
the tls session's snd_tag pointer NULL. ktls_cleanup()
tries to release the send tag, and will trip over
this NULL pointer and panic unless NULL is checked for.

Reviewed by:	jhb
Sponsored by:	Netflix
This commit is contained in:
Andrew Gallatin 2020-09-04 17:36:15 +00:00
parent cb55665190
commit 9675d8895a
1 changed files with 2 additions and 1 deletions
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3
sys/kern/uipc_ktls.c
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@ -680,7 +680,8 @@ ktls_cleanup(struct ktls_session *tls)
counter_u64_add(ktls_ifnet_gcm, -1);
break;
}
m_snd_tag_rele(tls->snd_tag);
if (tls->snd_tag != NULL)
m_snd_tag_rele(tls->snd_tag);
break;
#ifdef TCP_OFFLOAD
case TCP_TLS_MODE_TOE: