Merge tag 'misc-fixes-pull-request' of https://gitlab.com/berrange/qemu into staging

Misc sockets, crypto and VNC fixes

* Fix rare EADDRINUSE failures on OpenBSD platforms seen
  with migration
* Fix & test overwriting of hash output buffer
* Close connection instead of returning empty SASL mechlist to
  VNC clients
* Fix handling of SASL SSF on VNC server UNIX sockets
* Fix handling of NULL SASL server data in VNC server
* Validate trailing NUL padding byte from SASL client
* Fix & test AF_ALG crypto backend build
* Remove unused code in sockets and crypto subsystems

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# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* tag 'misc-fixes-pull-request' of https://gitlab.com/berrange/qemu:
  gitlab: enable afalg tests in fedora system test
  ui: validate NUL byte padding in SASL client data more strictly
  ui: fix handling of NULL SASL server data
  ui/vnc: don't check for SSF after SASL authentication on UNIX sockets
  ui/vnc: fix skipping SASL SSF on UNIX sockets
  ui/vnc: don't raise error formatting socket address for non-inet
  ui/vnc: don't return an empty SASL mechlist to the client
  crypto/hash-afalg: Fix broken build
  include/crypto: clarify @result/@result_len for hash/hmac APIs
  tests: correctly validate result buffer in hash/hmac tests
  crypto/hash: avoid overwriting user supplied result pointer
  util: don't set SO_REUSEADDR on client sockets
  sockets: Remove deadcode
  crypto: Remove unused DER string functions

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 11 insertions, 3 deletions

diff --git a/crypto/hash-nettle.c b/crypto/hash-nettle.c
index 3b847aa60e..c78624b347 100644
--- a/crypto/hash-nettle.c
+++ b/crypto/hash-nettle.c
@@ -150,9 +150,17 @@ int qcrypto_nettle_hash_finalize(QCryptoHash *hash,
                                  Error **errp)
 {
     union qcrypto_hash_ctx *ctx = hash->opaque;
-
-    *result_len = qcrypto_hash_alg_map[hash->alg].len;
-    *result = g_new(uint8_t, *result_len);
+    int ret = qcrypto_hash_alg_map[hash->alg].len;
+
+    if (*result_len == 0) {
+        *result_len = ret;
+        *result = g_new(uint8_t, *result_len);
+    } else if (*result_len != ret) {
+        error_setg(errp,
+                   "Result buffer size %zu is smaller than hash %d",
+                   *result_len, ret);
+        return -1;
+    }
 
     qcrypto_hash_alg_map[hash->alg].result(ctx, *result_len, *result);