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upstream: avoid fatal() exit of ssh-pkcs11-helper if asked to

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sign a zero-length ed25519 signature.

Anthropic ANT-2026-D209X7KS

OpenBSD-Commit-ID: aef2188ffd4494b3f8decaa595aef00015a16fd1
This commit is contained in:
djm@openbsd.org authored and Damien Miller committed 2026-10-30 20:10:14 +11:00
1 parent ea370e65cf
commit 340865c6e6
1 file changed
+3 -2
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ssh-pkcs11.c
+3 -2
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@@ -1,4 +1,4 @@
/* $OpenBSD: ssh-pkcs11.c,v 1.78 2026/03/03 09:57:25 dtucker Exp $ */
/* $OpenBSD: ssh-pkcs11.c,v 1.79 2026/10/30 02:02:22 djm Exp $ */
/*
* Copyright (c) 2010 Markus Friedl. All rights reserved.
* Copyright (c) 2014 Pedro Martelletto. All rights reserved.
@@ -744,7 +744,8 @@ pkcs11_sign_ed25519(struct sshkey *key,
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
xdata = xmalloc(datalen);
/* copy data as C_Sign() takes a non-const pointer; datalen may be 0 */
xdata = xmalloc(MAXIMUM(datalen, 1));
memcpy(xdata, data, datalen);
sig = xmalloc(crypto_sign_ed25519_BYTES);
slen = crypto_sign_ed25519_BYTES;